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Question

cot 4x (sin 5x + sin 3x) = cot x (sin 5x – sin 3x)

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Solution

L.H.S = cot 4x (sin 5x + sin 3x)

= 2 cos 4x cos x

R.H.S. = cot x (sin 5x – sin 3x)

= 2 cos 4x. cos x

L.H.S. = R.H.S.


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