Differentiate the functions w.r.t. \( x \) : \[ \cos ^{-1}\left(\frac{1-x^{2}}{1+x^{2}}\right) \]

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Differentiate the
functions w.r.t. \( x \) :
\[
\cos ^{-1}\left(\frac{1-x^{2}}{1+x^{2}}\right)
\]
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