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TS EAPCET (Engineering) Inverse Trig — practice questions

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$\dfrac{d}{dx}( in^{-1} x)$ equals:If $y = \tan^{-1}\left(\dfrac{2x}{1-x^2}\right)$, then $\dfrac{dy}{dx}$ equals:If $y = in^{-1}(2x qrt{1-x^2})$ for $-1/ qrt 2 < x < 1/ qrt 2$, then $\dfrac{dy}{dx}$ equals:$\dfrac{d}{dx}\left[\cos^{-1}\left(\dfrac{1-x^2}{1+x^2}\right)\right]$ for $x > 0$ equals: