cot 4x(sin 5x + sin 3x)/cot x(sin 5x - sin 3x) =1
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L.H.S. = cot 4x (sin 5x + sin 3x) From (i) and (ii), we get cot 4x (sin 5x + sin 3x) = cot x (sin 5x – sin 3x). L.H.S. = R.H.S.
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