Solve this following

Question:

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

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

A. 1

B. $-1$

C. $\frac{1}{2}$

D. $\frac{-1}{2}$

Solution:

Given that $y=\tan ^{-1}\left(\frac{1-\cos x}{\sin x}\right)$

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