જો $\int e^{-x} \tan ^{-1}\left(e^x\right) d x = f(x) - \frac{1}{2} \log \left(1+e^{2 x}\right) + C$ હોય, તો $f(x)$ ની કિંમત શું થાય?

  • A
    $e^x - e^{-x} \tan ^{-1}\left(e^x\right)$
  • B
    $x^2 + e^{-x} \tan ^{-1}\left(e^x\right)$
  • C
    $-e^{-x} \tan ^{-1}\left(e^x\right)$
  • D
    $x - e^{-x} \tan ^{-1}\left(e^x\right)$

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જો $\int \frac{(x-1) dx}{(x+1) \sqrt{x^3+x^2+x}} = f(x) + C$ હોય, તો $f(1) =$

$\int 2x \cos^3(x^2) \sin(x^2) \, dx = $

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