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Question -

Prove that:┬аcot 4x┬а(sin 5x┬а+ sin 3x) = cot┬аx┬а(sin5x┬атАУ sin 3x)



Answer -

Consider
LHS = cot 4x (sin 5x + sin 3x)
It can be written as
┬а
Using the formula
= 2 cos 4x cos x
Hence, LHS = RHS.

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