Question

find the value of sin 18
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Answer 1

Answer:

Exact Value of sin 18°

How to find exact value of sin 18°?

Let A = 18°

Therefore, 5A = 90°

⇒ 2A + 3A = 90˚

⇒ 2θ = 90˚ - 3A.

Taking sine on both sides, we get.

sin 2A = sin (90˚ - 3A) = cos 3A.

⇒ 2 sin A cos A = 4 cos^3 A - 3 cos A.

Step-by-step explanation:

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Answer 2

Answer:

0.3090169944

Step-by-step explanation:

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