The derivative of $\tan ^{-1}\left(\frac{\sin x-\cos x}{\sin x+\cos x}\right)$, with
respect to $\frac{x}{2}$, where $\left(x \in\left(0, \frac{\pi}{2}\right)\right)$ is :
$\frac{1}{2}$
$\frac{2}{3}$
1
2
Correct Option: , 4
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