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What is the value of COS 10 COS 20 COS 40?

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What is the value of COS 10 COS 20 COS 40?

How to prove that cos 10*cos 20*cos 40 = 1/8 cot 10 – Quora.

What is the value of cos 20 into COS 40 into COS 80?

1/8
Detailed Solution. ∴ The value of cos 20° ⨯ cos 40°⨯ cos 80° is 1/8.

What is the value of which of the above statements is are correct 8 COS 10 COS 20 COS 40?

Detailed Solution. Hence, option (2) is correct.

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What is value of cos 10 degree?

Cos 10 degrees is the value of cosine trigonometric function for an angle equal to 10 degrees. The value of cos 10° is 0.9848 (approx)

How do you find the value of cos 20 degrees?

The value of cos 20 degrees can be calculated by constructing an angle of 20° with the x-axis, and then finding the coordinates of the corresponding point (0.9397, 0.342) on the unit circle. The value of cos 20° is equal to the x-coordinate (0.9397). ∴ cos 20° = 0.9397.

How do you find the value of cos 20?

What sin is equal to cos 40?

Because only one of the answers can be correct, look for the simplest relationship (complementary angles): 50° is complementary to 40°, so cos 40° = sin 50°, which means (A) is correct.

What is the value of cos 20 degree in fraction?

0.9396926
⇒ 20 degrees = 20° × (π/180°) rad = π/9 or 0.3490 . . . Explanation: For cos 20 degrees, the angle 20° lies between 0° and 90° (First Quadrant). Since cosine function is positive in the first quadrant, thus cos 20° value = 0.9396926. . .

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How do you find cos 20 without a calculator?

How do you solve cos 40?

How to Find the Value of Cos 40 Degrees? The value of cos 40 degrees can be calculated by constructing an angle of 40° with the x-axis, and then finding the coordinates of the corresponding point (0.766, 0.6428) on the unit circle. The value of cos 40° is equal to the x-coordinate (0.766). ∴ cos 40° = 0.766.

What is the value of cos 20 * CoS 40 * Cos 80?

Prove that cos 20 degree * cos 40 degree * cos 80 degree =1/8. Was this answer helpful? Thank you. Your Feedback will Help us Serve you better.

What is the value of cos 45 degrees?

The exact value of cos 45 degrees is 1/√2 (in surd form), which is also equal to sin 45 degrees. It is an irrational number, equal to 0.7071067812… in decimal form.

What is the value of sin 2 θ + cos2 θ?

\\sin^2 heta + \\cos^2 heta = 1. sin2 θ+cos2 θ = 1. In order to prove trigonometric identities, we generally use other known identities such as Pythagorean identities.

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How do you find 1 + cot2θ = csc2 θ?

The identity 1 + cot2θ = csc2θ is found by rewriting the left side of the equation in terms of sine and cosine. Similarly, 1 + tan2θ = sec2θ can be obtained by rewriting the left side of this identity in terms of sine and cosine. This gives

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