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if int(tanx-tanalpha)/(tanx+tanalpha)dx=...

if `int(tanx-tanalpha)/(tanx+tanalpha)dx=f(x).cos2alpha+g(x).sin2alpha+c` then f(x) and g(x) respectively. Are

A

x, `lnsin(x+alpha)`

B

`cos2x,lnsin(x+2alpha)`

C

`cos2x,-lnsin(x+alpha)`

D

`x,-lnsin(x+alpha)`

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Verified by Experts

The correct Answer is:
D
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