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How to prove it's an identity sin y + sin 3y + sin 5y + sin 7y = 4 cos y cos 2y sin 4y
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6 votes
How to prove it's an identity
sin y + sin 3y + sin 5y + sin 7y = 4 cos y cos 2y sin 4y

User Nuzhat Ansari
by
4.1k points

1 Answer

6 votes

Answer:

0.9777102203

Explanation:

the identity is 0.9777102203

User Faria
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3.1k points
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