$\int \frac{e^{\tan ^{-1} x}}{1+x^2}\left[\left(\sec ^{-1} \sqrt{1+x^2}\right)^2+\cos ^{-1}\left(\frac{1-x^2}{1+x^2}\right)\right] d x=$

  • A
    $e^{\tan ^{-1} x}(\tan ^{-1} x)^2+C$
  • B
    $e^{\tan ^{-1} x}(\sec ^{-1} x)^2+C$
  • C
    $e^{\tan ^{-1} x}(\sec ^{-1} \sqrt{1+x^2})+C$
  • D
    $e^{\tan ^{-1} x}(\cos ^{-1}(\frac{1-x^2}{1+x^2}))+C$

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$\int \frac{(x^{2}+1) e^{x}}{(x+1)^{2}} d x=f(x) e^{x}+C$,જ્યાં $C$ અચળ છે,તો $x = 1$ આગળ $\frac{d^{3} f}{d x^{3}}$ ની કિંમત શોધો.

ધારો કે $f(t) = \int \left( \frac{1 - \sin(\ln t)}{1 - \cos(\ln t)} \right) dt$, $t > 1$ માટે. જો $f(e^{\pi/2}) = -e^{\pi/2}$ અને $f(e^{\pi/4}) = \alpha e^{\pi/4}$ હોય, તો $\alpha$ ની કિંમત શોધો.

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