Mark against the correct answer in the following:

Question:

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

If $y=\cos ^{-1}\left(\frac{x^{2}-1}{x^{2}+1}\right)$ then $\frac{d y}{d x}=?$

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

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

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

D. none of these

Solution:

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