Question

find the value of sin18°​

Answer 1

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★ Question :-

find the value of sin18°

★ Solution in the attachment :-

Answer 2

Answer:

Letα=18°. Then 2α=36°=90°-54°=90°-3α. sin(90–3α)=cos3α=4cos³α-3cosα.

Step-by-step explanation:

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