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Prove that : sin 2x + 2 sin 4x + sin 6x ...

Prove that : `sin 2x + 2 sin 4x + sin 6x = 4 cos^2 x sin 4x`.

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sin 2 x + 2 sin 4x + sin 6x = 4 cos ^(2) x sin 4x

sin 3 x + 2 csin 4x + sin 6x = 4 cos ^(2) x sin 4x

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sin 3 x + 2 csin 4x + sin 6x = 4 cos ^(2) x sin 4x

Prove that sin 2 x+2 sin 4 x+sin 6 x=4 cos ^(2) x sin 4 x

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