1)

If f(x)log(sinx)dx=log[logsinx]+c , then f(x)  is equal to


A) cot x

B) tan x

C) sec x

D) cosec x

Answer:

Option A

Explanation:

Given,   f(x)log(sinx)dx=log[logsinx]+c

On differentiating both sides , we get

f(x)log(sinx)=1logsinxddx(logsinx)+0

     f(x)log(sinx)=1logsinx×1sinx×cosx

     f(x)  = cot x