Maths Math Article Trigonometric Functions Value Of Cos 60 Value of cos 60 The value of cos 60 is 1/2. Trigonometry is used to study the measurements of right-angled triangles that deals with the parameters such as length, height and angles of the triangle. It has an enormous application in the real world. Tentukan Nilai yang Tepat cos(-60 derajat ) Step 1. Terapkan sudut acuan dengan mencari sudut dengan nilai-nilai-trigonometri yang setara di kuadran pertama.Solve your math problems using our free math solver with step-by-step solutions. Our math solver supports basic math, pre-algebra, algebra, trigonometry, calculus and more.The value is sqrt3/2. You can do each calculation separately and do all the math, or you can recognize the angle difference formula for cosine: cos(A-B)=cosAxxcosB+sinAxxsinB In this case, A is 60^@ and B is 30^@.This formula can be simplified to −sin60 = − 23 Explanation: sin20cos80−cos20sin80 = sin(20 −80)= sin(−60)= −sin60 = − 23. How do you find the exact value of sin45cos 30 − cos45sin30 using the sum and difference, double angle or half angle formulas? sin15 = ( 42)( 3 −1) Explanation: Use trig identity: sin (a - b) = sin a.cos b ...Free trigonometric simplification calculator - Simplify trigonometric expressions to their simplest form step-by-step Sep 23, 2019 · In this video, we learn to find the value of cos(-60). Here I have applied cos(-x) = cos(x) identity to find the value of cosine of -60 degree. The URL of th... Since the cosine function is a periodic function, we can represent cos 135° as, cos 135 degrees = cos(135° + n × 360°), n ∈ Z. ⇒ cos 135° = cos 495° = cos 855°, and so on. Note: Since, cosine is an even function , the value of cos(-135°) = cos(135°).Cosine of Complex Angles Specified in Degrees. Create an array of three complex angles and compute the cosine. y = 1×3 complex -1.0002 + 0.0000i 0.7075 - 0.0247i 0.9862 - 0.0091i.Click here👆to get an answer to your question ️ Solve cos A . cos (60 + A). cos (60 - A) = 14cos 3ALearn and revise trigonometric ratios of sine, cosine and tangent and calculate angles and lengths in right-angled triangles with GCSE Bitesize AQA Maths. ... [\cos{60} = \frac{1}{2}\] tan(45^@)=1 sin(45^@)=sqrt2/2 cos(45^@)=sqrt2/2 45^@ is a special angle, along with 30^@, 60^@, 90^@, 180^@, 270^@, 360^@. tan(45^@)=1 sin(45^@)=sqrt2/2 cos(45 ...Trigonometry. Find the Exact Value cos (60 degrees ) Step 1. The exact value of is . Step 2. The result can be shown in multiple forms. Exact Form:Trigonometry is a branch of mathematics that deals with the relationships between the sides and angles of triangles. It uses functions such as sine, cosine, and tangent to describe the ratios of the sides of a right triangle based on its angles.Feb 21, 2023 · Because cos () is a static method of Math, you always use it as Math.cos (), rather than as a method of a Math object you created ( Math is not a constructor). Free math problem solver answers your trigonometry homework questions with step-by-step explanations. The values of trigonometric numbers can be derived through a combination of methods. The values of sine and cosine of 30, 45, and 60 degrees are derived by analysis of the 30-60-90 and 90-45-45 triangles. If the angle is expressed in radians as , this takes care of the case where a is 1 and b is 2, 3, 4, or 6.Cos 25 degrees is the value of cosine trigonometric function for an angle equal to 25 degrees. The value of cos 25° is 0.9063 (approx) How to Find Cos 25° in Terms of Other Trigonometric Functions? Using trigonometry formula, the value of cos 25° can be given in terms of other trigonometric functions as: ± √(1-sin²(25°)) Encontre o Valor Exato cos(60) Step 1. O valor exato de é . Step 2. O resultado pode ser mostrado de várias formas. Forma exata: Forma decimal: Cookies e privacidade.Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor.Online cosine calculator. Accepts values in radians and in degrees. Free online cosine calculator. cos(x) calculator.Solve your math problems using our free math solver with step-by-step solutions. Our math solver supports basic math, pre-algebra, algebra, trigonometry, calculus and more.Exact values of sin(60), cos(60), tan(60), csc(60), sec(60), cot(60), Find exact values of all trigonometric functions when the angle is 60 degrees,blackpenr...Since the cosine function is a periodic function, we can represent cos 135° as, cos 135 degrees = cos(135° + n × 360°), n ∈ Z. ⇒ cos 135° = cos 495° = cos 855°, and so on. Note: Since, cosine is an even function , the value of cos(-135°) = cos(135°). An interesting trigonometry problem -- featuring roots of unity. YouTube Basic trigonometry | Basic trigonometry | Trigonometry | Khan Academy YouTube More Videos (sin(x))2 ⋅ ((cot(x))2 + 1) cos(π) tan(x) cos(3x + π) = 0.5 cot(x)sec(x) sin(x)Aug 4, 2016 · Explanation: Imagine the unit circle: We know that 300∘ is in the fourth quadrant, where cosine is positive. 300∘ has a reference angle of 60∘, since it is 60∘ away from the x -axis. Since cos(60∘) = 1 2, we know that cos(300∘) = 1 2 as well since cos(θ) > 0 in the fourth quadrant. Answer link. The proof of the formula is easily found in the web. Starting from cos 60 degree = 1/2, cos30, cos15, cos (15/2), cos (15/4),cos (15/8), cos (15/16) Thus we can calculate value of cos (15/16) degree and may hope it an approximate value of cos 1 degree. Please try it if you have an interest in this method.Explanation: For cos 60 degrees, the angle 60° lies between 0° and 90° (First Quadrant ). Since cosine function is positive in the first quadrant, thus cos 60° value = 1/2 or 0.5 Since the cosine function is a periodic function, we can represent cos 60° as, cos 60 degrees = cos (60° + n × 360°), n ∈ Z. ⇒ cos 60° = cos 420° = cos 780°, and so on.Feb 21, 2023 · Because cos () is a static method of Math, you always use it as Math.cos (), rather than as a method of a Math object you created ( Math is not a constructor). Feb 21, 2017 · Exact values of sin(60), cos(60), tan(60), csc(60), sec(60), cot(60), Find exact values of all trigonometric functions when the angle is 60 degrees,blackpenr... Tentukan Nilai yang Tepat cos(60 derajat ) Step 1. Nilai eksak dari adalah . Step 2. Hasilnya dapat ditampilkan dalam beberapa bentuk. Bentuk Eksak: Bentuk Desimal:May 29, 2023 · For memorising cos 0°, cos 30°, cos 45°, cos 60° and cos 90°. Cos is the opposite of sin. We should learn it like. cos 0° = sin 90° = 1. cos 30° = sin 60° = √3/2. cos 45° = sin 45° = 1/√2. cos 60° = sin 30° = 1/2. cos 90° = sin 0° = 0. So, for cos, it will be like. cos (135) cos ( 135) Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because cosine is negative in the second quadrant. −cos(45) - cos ( 45) The exact value of cos(45) cos ( 45) is √2 2 2 2. − √2 2 - 2 2. The result can be shown in multiple forms.Learn to find the sine, cosine, and tangent of 45-45-90 triangles and also 30-60-90 triangles. Until now, we have used the calculator to evaluate the sine, cosine, and tangent of an angle. However, it is possible to evaluate the trig functions for certain angles without using a calculator.Q. Evaluate sin60∘ cos30∘ +cos60∘sin30∘. Q. Evaluate each of the following. sin 60 cos 30° + cos 60° sin 30°. Q. Find the values of -. (i) 5 sin 30 ° + 3 tan 45 ° (ii) 4 5 tan 2 60 ° + 3 sin 2 60 ° (iii) 2sin 30 ° + cos 0 ° + 3sin 90°. (iv) tan 60 sin 60 + cos 60 (v) cos 2 45 ° + sin 2 30 ° (vi) cos 60 ° × cos 30 ° + sin ...Tentukan Nilai yang Tepat cos(-60 derajat ) Step 1. Terapkan sudut acuan dengan mencari sudut dengan nilai-nilai-trigonometri yang setara di kuadran pertama.Learn and revise trigonometric ratios of sine, cosine and tangent and calculate angles and lengths in right-angled triangles with GCSE Bitesize AQA Maths. ... [\cos{60} = \frac{1}{2}\]Aug 16, 2023 · Transcript. Ex 8.2, 1 Evaluate the following : (i) sin 60° cos 30° + sin 30° cos 60° We know that, sin 60° = √3/2 cos 30° = √3/2 sin 30° = 1/2 cos 60° = 1/2 Putting all values sin 60° cos 30° + sin 30° cos 60° = (√𝟑/𝟐)× (√𝟑/𝟐)+ (𝟏/𝟐)× (𝟏/𝟐) = (√3 × √3)/ (2 × 2)+1/ (2 × 2) = 𝟑/𝟒 + 𝟏 ... Option D is correct, the value of Cos 60 degrees is 1/2 from the triangle. We have to find the value of cops 60 degrees from the given triangle. The given triangle is a right angled triangle. We know that the cosine function is a ratio of adjacent side and hypotenuse. The adjacent side to leg of angle 60 is 1. The hypotenuse is 2. Cos60= 1/2.The cosine function is an even function because cos (− θ) = cos θ. cos (− θ) = cos θ. For example, consider corresponding inputs π 4 π 4 and − π 4. − π 4. The output of cos (π 4) cos (π 4) is the same as the output of cos (− π 4). cos (− π 4). Thus, Solve (sin x - cos x) = 0. Ans: 4π and 45π Explanation: Use trig identity: sinx−cosx= 2sin(x− 4π) ... How do you write the trigonometric form into a complex number in standard form 7(cos 0 + isin0) ? 7 or 7+0i Explanation: Begin by evaluating the trigonometric part inside the bracket. Reminder (∣(aa)(cos0 = 1 and sin0 = 0)(aa)∣) ...Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor. Learn to find the sine, cosine, and tangent of 45-45-90 triangles and also 30-60-90 triangles. Until now, we have used the calculator to evaluate the sine, cosine, and tangent of an angle. However, it is possible to evaluate the trig functions for certain angles without using a calculator. Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor.240^o has a reference angle of 60^o as indicated in the image below. A 60^o angle is a basic angle from one of the common triangles: From their definitions: sin(240^o) = -sqrt(3)/2 cos(240^o) = -1/2 tan(240^o) = sqrt(3) csc(240^o) = - 2/sqrt(3) sec(240^o) = -2 cot(240^o) = 1/sqrt(3)In this video, we learn to find the value of cos(-60). Here I have applied cos(-x) = cos(x) identity to find the value of cosine of -60 degree. The URL of th...Free trigonometric simplification calculator - Simplify trigonometric expressions to their simplest form step-by-stepFree math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor. For memorising cos 0°, cos 30°, cos 45°, cos 60° and cos 90°. Cos is the opposite of sin. We should learn it like. cos 0° = sin 90° = 1. cos 30° = sin 60° = √3/2. cos 45° = sin 45° = 1/√2. cos 60° = sin 30° = 1/2. cos 90° = sin 0° = 0. So, for cos, it will be like.Note that cos−1 does not mean 1 cos as we are used to in algebra. cos−1 is the notation used for arc-cos. cos30° = 0.866 ⇔ cos−1(0.866) = 30°. In this case cos−1(0.60) is asking the question.. "Which angle has a cos value of 0.60?" The only way to determine this is with a calculator or tables. Using a graph is possible, but not ...Jun 10, 2021 · What is quadrantal angle? A Quadrantal angle is an angle that is not in Quadrant I. Consider angle 120. You want to find cos (120) . 120 lies in quadrant II. Also, 120=180-60. So, it is enough to find cos (60) and put the proper sign. cos (60)=1/2. Cosine is negative in quadrant II, Therefore, cos (120) = -1/2. The displacement h (t), h (t), in centimeters, of a mass suspended by a spring is modeled by the function h (t) = −5 cos (60 π t), h (t) = −5 cos (60 π t), where t t is measured in seconds. Find the amplitude, period, and frequency of this displacement.The Cosine function ( cos (x) ) The cosine is a trigonometric function of an angle, usually defined for acute angles within a right-angled triangle as the ratio of the length of the adjacent side to the hypotenuse. It is the complement to the sine. In the illustration below, cos (α) = b/c and cos (β) = a/c.This formula can be simplified to −sin60 = − 23 Explanation: sin20cos80−cos20sin80 = sin(20 −80)= sin(−60)= −sin60 = − 23. How do you find the exact value of sin45cos 30 − cos45sin30 using the sum and difference, double angle or half angle formulas? sin15 = ( 42)( 3 −1) Explanation: Use trig identity: sin (a - b) = sin a.cos b ...Jan 1, 2017 · Note that cos−1 does not mean 1 cos as we are used to in algebra. cos−1 is the notation used for arc-cos. cos30° = 0.866 ⇔ cos−1(0.866) = 30°. In this case cos−1(0.60) is asking the question.. "Which angle has a cos value of 0.60?" The only way to determine this is with a calculator or tables. Using a graph is possible, but not ... Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor.Learn to find the sine, cosine, and tangent of 45-45-90 triangles and also 30-60-90 triangles. Until now, we have used the calculator to evaluate the sine, cosine, and tangent of an angle. However, it is possible to evaluate the trig functions for certain angles without using a calculator. May 8, 2015 · 240^o has a reference angle of 60^o as indicated in the image below. A 60^o angle is a basic angle from one of the common triangles: From their definitions: sin(240^o) = -sqrt(3)/2 cos(240^o) = -1/2 tan(240^o) = sqrt(3) csc(240^o) = - 2/sqrt(3) sec(240^o) = -2 cot(240^o) = 1/sqrt(3) What are the exact values of cos150° and sin150° ? cos150 = − 23 sin150 = 21 Explanation: Use trig table and unit circle --> cos150 = cos(−30+180) = −cos(−30)= ... Calculate the value of the cos of 1.5 ° To enter an angle in radians, enter cos (1.5RAD) cos (1.5 °) = 0.999657324975557 Cosine the trigonometric function that is equal ...Trigonometry is a branch of mathematics that deals with the relationships between the sides and angles of triangles. It uses functions such as sine, cosine, and tangent to describe the ratios of the sides of a right triangle based on its angles.You can enter input as either a decimal or as the opposite over the adjacent. Method 1: Decimal. Enter a decimal number. Method 2: Opposite / Adjacent. Entering the ratio of the opposite side divided by the adjacent. (review inverse tangent here ) Decimal. Opposite / Adjacent. Inverse tangent: Degrees.Free math problem solver answers your algebra, geometry, trigonometry, calculus, and statistics homework questions with step-by-step explanations, just like a math tutor. May 29, 2023 · For memorising cos 0°, cos 30°, cos 45°, cos 60° and cos 90°. Cos is the opposite of sin. We should learn it like. cos 0° = sin 90° = 1. cos 30° = sin 60° = √3/2. cos 45° = sin 45° = 1/√2. cos 60° = sin 30° = 1/2. cos 90° = sin 0° = 0. So, for cos, it will be like. May 29, 2023 · For memorising cos 0°, cos 30°, cos 45°, cos 60° and cos 90°. Cos is the opposite of sin. We should learn it like. cos 0° = sin 90° = 1. cos 30° = sin 60° = √3/2. cos 45° = sin 45° = 1/√2. cos 60° = sin 30° = 1/2. cos 90° = sin 0° = 0. So, for cos, it will be like. cos 60° = √ (1/4) = 1/2. cos 90° = √ (0/4) = 0. Since, we know the sin and cos value of the standard angles from the trigonometrical ratios table; therefore we can easily find the values of the other trigonometrical ratios of the standard angles. The tangent of the standard angles 0°, 30°, 45°, 60° and 90°: tan 0° = 0. tan 30 ...Find the Exact Value cos(-60 degrees ) Step 1. Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Step 2. The exact ...Click here👆to get an answer to your question ️ Solve cos A . cos (60 + A). cos (60 - A) = 14cos 3AWhat are the exact values of cos150° and sin150° ? cos150 = − 23 sin150 = 21 Explanation: Use trig table and unit circle --> cos150 = cos(−30+180) = −cos(−30)= ... Calculate the value of the cos of 1.5 ° To enter an angle in radians, enter cos (1.5RAD) cos (1.5 °) = 0.999657324975557 Cosine the trigonometric function that is equal ...Aug 31, 2023 · How to find the Value of Cos 60? You can represent the value of cos 60 degrees in terms of different angles like 0°, 90°, 180°, 270°. You can also represent it with the help of several other trigonometric sine functions. Consider the unit circle in a cartesian plane as given below. The cartesian plane can be divided into four quadrants. Free trigonometric simplification calculator - Simplify trigonometric expressions to their simplest form step-by-step Solve (sin x - cos x) = 0. Ans: 4π and 45π Explanation: Use trig identity: sinx−cosx= 2sin(x− 4π) ... How do you write the trigonometric form into a complex number in standard form 7(cos 0 + isin0) ? 7 or 7+0i Explanation: Begin by evaluating the trigonometric part inside the bracket. Reminder (∣(aa)(cos0 = 1 and sin0 = 0)(aa)∣) ...Q. Evaluate sin60∘ cos30∘ +cos60∘sin30∘. Q. Evaluate each of the following. sin 60 cos 30° + cos 60° sin 30°. Q. Find the values of -. (i) 5 sin 30 ° + 3 tan 45 ° (ii) 4 5 tan 2 60 ° + 3 sin 2 60 ° (iii) 2sin 30 ° + cos 0 ° + 3sin 90°. (iv) tan 60 sin 60 + cos 60 (v) cos 2 45 ° + sin 2 30 ° (vi) cos 60 ° × cos 30 ° + sin ... The Cosine function ( cos (x) ) The cosine is a trigonometric function of an angle, usually defined for acute angles within a right-angled triangle as the ratio of the length of the adjacent side to the hypotenuse. It is the complement to the sine. In the illustration below, cos (α) = b/c and cos (β) = a/c. Free trigonometric function calculator - evaluate trigonometric functions step-by-stepdouble cos (double x); float cosf (float x);long double cosl (long double x); ... The cosine of 60.000000 degrees is 0.500000. See also sin Compute sine (function) tan Definition of cosine The cosine of an angle is defined as the sine of the complementary angle. The complementary angle equals the given angle subtracted from a right angle, 90°. For instance, if the angle is 30°, then its complement is 60°. Generally, for any angle θ, cos θ = sin (90° – θ). Free trigonometric simplification calculator - Simplify trigonometric expressions to their simplest form step-by-step Free math problem solver answers your trigonometry homework questions with step-by-step explanations.You can enter input as either a decimal or as the opposite over the adjacent. Method 1: Decimal. Enter a decimal number. Method 2: Opposite / Adjacent. Entering the ratio of the opposite side divided by the adjacent. (review inverse tangent here ) Decimal. Opposite / Adjacent. Inverse tangent: Degrees. Click here👆to get an answer to your question ️ Solve cos A . cos (60 + A). cos (60 - A) = 14cos 3Acos120 = cos(180 − 60) = cos180cos60 + sin180sin60. (using the formula, cos(a + b) = cosacosb +sinasinb. Now,we know, cos180 = − 1,cos60 = 1 2,sin180 = 0,sin60 = √3 2. So,putting the value,we get, cos120 = − 1 × (1 2) +0 × √3 2 = − 1 2 = − cos60. Remember the formula cos(180 − θ) = − cosθ for shorter approach. Answer link.The displacement h (t), h (t), in centimeters, of a mass suspended by a spring is modeled by the function h (t) = −5 cos (60 π t), h (t) = −5 cos (60 π t), where t t is measured in seconds. Find the amplitude, period, and frequency of this displacement. Free trigonometric function calculator - evaluate trigonometric functions step-by-stepSo we have proved LHS = = RHS. cos A. cos(60 + A). cos(60 − A) = 1 4cos 3A cos A. cos ( 60 + A). cos ( 60 − A) = 1 4 cos 3 A. Hence proved. Note: Carefully read the question. Here to prove LHS = = RHS you should be familiar with the identities. Most of the mistakes are done while simplifying so kindly avoid the mistakes while simplifying.
Question 1) Give a short derivation of cos 60 degree. Solution) Let us consider a right- angled triangle with one angle as 60°. The other two angles of the triangle are 90°,30° . For a triangle with angles 60°,90°,30° the sides are always in the ratio 1: 2: 3–√ 3. In a right –angled triangle,. Zdxwafcv6p9
Aug 31, 2023 · So we have proved LHS = = RHS. cos A. cos(60 + A). cos(60 − A) = 1 4cos 3A cos A. cos ( 60 + A). cos ( 60 − A) = 1 4 cos 3 A. Hence proved. Note: Carefully read the question. Here to prove LHS = = RHS you should be familiar with the identities. Most of the mistakes are done while simplifying so kindly avoid the mistakes while simplifying. What are the exact values of cos150° and sin150° ? cos150 = − 23 sin150 = 21 Explanation: Use trig table and unit circle --> cos150 = cos(−30+180) = −cos(−30)= ... Calculate the value of the cos of 1.5 ° To enter an angle in radians, enter cos (1.5RAD) cos (1.5 °) = 0.999657324975557 Cosine the trigonometric function that is equal ...Transcript. Ex 8.2, 1 Evaluate the following : (i) sin 60° cos 30° + sin 30° cos 60° We know that, sin 60° = √3/2 cos 30° = √3/2 sin 30° = 1/2 cos 60° = 1/2 Putting all values sin 60° cos 30° + sin 30° cos 60° = (√𝟑/𝟐)× (√𝟑/𝟐)+ (𝟏/𝟐)× (𝟏/𝟐) = (√3 × √3)/ (2 × 2)+1/ (2 × 2) = 𝟑/𝟒 + 𝟏 ...So we have proved LHS = = RHS. cos A. cos(60 + A). cos(60 − A) = 1 4cos 3A cos A. cos ( 60 + A). cos ( 60 − A) = 1 4 cos 3 A. Hence proved. Note: Carefully read the question. Here to prove LHS = = RHS you should be familiar with the identities. Most of the mistakes are done while simplifying so kindly avoid the mistakes while simplifying.Aug 4, 2016 · Explanation: Imagine the unit circle: We know that 300∘ is in the fourth quadrant, where cosine is positive. 300∘ has a reference angle of 60∘, since it is 60∘ away from the x -axis. Since cos(60∘) = 1 2, we know that cos(300∘) = 1 2 as well since cos(θ) > 0 in the fourth quadrant. Answer link. What is tan 30 using the unit circle? tan 30° = 1/√3. To find this answer on the unit circle, we start by finding the sin and cos values as the y-coordinate and x-coordinate, respectively: sin 30° = 1/2 and cos 30° = √3/2. Now use the formula. Recall that tan 30° = sin 30° / cos 30° = (1/2) / (√3/2) = 1/√3, as claimed.Explanation: The reference angle for 240∘ is 60∘ (since 240∘ = 180∘ + 60∘) 60∘ is an angle of one of the standard triangles with. cos(60∘) = 1 2. 240∘ is in the 3rd quadrant so (either by CAST or noting that the "x-side" of the associate triangle is negative) cos(240∘) = − cos(60∘) cos(240∘) = − 1 2. Answer link.The corresponding cosine values. This is a scalar if x is a scalar. Notes. If out is provided, the function writes the result into it, and returns a reference to out. (See Examples) References. M. Abramowitz and I. A. Stegun, Handbook of Mathematical Functions. New York, NY: Dover, 1972. ExamplesJun 5, 2023 · Firstly, we choose the cosine, i.e., cos (x) \cos(x) cos (x), from the list. Once we have that, we move to the variable field below, which contains the angle. We input 45 ° 45\degree 45° from our problem, and the moment we do that, the cofunction calculator will spit out the answer underneath: the cofunction along with the value. Online cosine calculator. Accepts values in radians and in degrees. Free online cosine calculator. cos(x) calculator. Free math problem solver answers your trigonometry homework questions with step-by-step explanations.Aug 14, 2023 · What is tan 30 using the unit circle? tan 30° = 1/√3. To find this answer on the unit circle, we start by finding the sin and cos values as the y-coordinate and x-coordinate, respectively: sin 30° = 1/2 and cos 30° = √3/2. Now use the formula. Recall that tan 30° = sin 30° / cos 30° = (1/2) / (√3/2) = 1/√3, as claimed. .
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