Solve this following

Question:

Mark $(\sqrt{)}$ against the correct answer in the following:

If $y=\cot ^{-1}\left(\frac{1-x}{1+x}\right)$ then $\frac{d y}{d x}=?$

A. $\frac{-1}{\left(1+x^{2}\right)}$

B. $\frac{1}{\left(1+x^{2}\right)}$

C. $\frac{-1}{\left(1+x^{2}\right)^{3 / 2}}$

D. none of these

Solution:

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