Question:
Mark $(\sqrt{ })$ against the correct answer in the following:
If $y=\tan ^{-1}\left\{\frac{\cos x+\sin x}{\cos x-\sin x}\right\}$ then $\frac{d y}{d x}=$ ?
A. 1
B. $-1$
C. $\frac{1}{2}$
D. $\frac{-1}{2}$
Solution:
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