Fewpal
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Prove that cot 4x (sin 5x + sin 3x) = cot x (sin 5x – sin 3x)

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L.H.S = cot4x(sin5x+sin3x)

⇒cotx(sin(4x+x)−sin(4x−x))

⇒cotx(sin5x−sin3x)=R.H.S

Hence proved.

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