The derivative of \( f(x)=a^{\tan ^{-1} x} \) is \( \mathrm{P} \) (...

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The derivative of \( f(x)=a^{\tan ^{-1} x} \) is
\( \mathrm{P} \)
(1) \( \frac{\ln a \times a^{\tan ^{-1} x}}{1+x^{2}} \)
(2) \( \frac{a^{\tan ^{-1} x}}{1+x^{2}} \)
W
(3) \( \frac{\ln a}{1+x^{2}} \)
(4) None of these
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