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Prove that sinx + sin3x + sin5x+ sin7x=4...

Prove that `sinx + sin3x + sin5x+ sin7x=4cosxcos2xsin4x`

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LHS
`= sin x + sin 3x + sin 5x + sin 7x`
`= (sin 5x + sin x) + (sin 7x + sin 3x)`
We have
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