" 30.Prove that "sin x+sin3x+sin5x+sin7x=4cos x cos2x sin4x^(*)

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Prove that : sin x+sin3x+sin5x+sin7x=4cos x\ cos2xsin4x

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Prove that: sin x + sin 3x + sin 5x + sin 7x= 4 cos x cos 2x sin 4x

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