\(\frac{d}{dx}[tan^{-1}(\frac{cosx+sinx}{cosx-sinx})]\) = 

d/dx[tan-1((cosx+sinx)/(cosx-sinx))] =

(A) \(\frac{\pi}{4}\) + x

(B) 1

(C) -1

(D) tan\(\frac{x}{2}\)

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1 Answers

Option : (B) 1

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