Mark $(\sqrt{)}$ against the correct answer in the following:
If $y=\tan ^{-1}(\sec x+\tan x)$ then $\frac{d y}{d x}=?$
A. $\frac{1}{2}$
B. $\frac{-1}{2}$
C. 1
D. none of these
$\frac{d y}{d x}=\frac{1}{2}$
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