If \( f(x)=\cos ^{-1} \frac{x-x^{-1}}{x+x^{-1}} \) then \( f^{\prim...

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If \( f(x)=\cos ^{-1} \frac{x-x^{-1}}{x+x^{-1}} \) then \( f^{\prime}(-2) \) is
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(a) \( \frac{2}{5} \)
(b) \( \frac{-2}{5} \)
(c) \( -\frac{1}{5} \)
(d) none of these
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