Mathematics, 08.03.2021 14:00 josuealejandro9632

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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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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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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Another question on Mathematics

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