A. √sin x/(2(1-cos x)√(1+cos x))
B. - √sin x/(2(1-cos x)√(1+cos x))
C. √sin x/ 2(1+cos x)√(1+cos x)
D. -√sin x/2(1+cos x)√(1+cos x)
If y={sin x/2 sin x2/2. Sin x3/23...sin xn/2n}then dy/dx=
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