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