Question

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2. Statement-1: cot 4x(sin 5x + sin 3x) = cot x(sin 5x
- sin 3x).
Statement-2: sin x + sin 3x + sin 5x + sin 7x = 4 cos x
cos 2 x sin 4x.
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Answer 1

Answer:

LHS=(sin(7x+sinx )=(sin5x+sin3x) =2 sin (7x+x2) cos (7x-x2)+2 sin (5x+3x2) cos (5x-3x2) =2 sin 4xcos 3x+2 ...