$\int_{-1}^{3} \left( \tan^{-1} \left( \frac{x}{x^2+1} \right) + \tan^{-1} \left( \frac{x^2+1}{x} \right) \right) dx$ નું મૂલ્ય શોધો.

  • A
    $2\pi$
  • B
    $\pi$
  • C
    $\frac{21}{5}\pi$
  • D
    $\frac{\pi}{4}$

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જો $f(x) = f(a-x)$ હોય, તો $\int_0^a x f(x) dx$ ની કિંમત શું થાય?

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