$\int_{-1}^3 \left(\tan^{-1}\left(\frac{x}{x^2+1}\right) + \tan^{-1}\left(\frac{x^2+1}{x}\right)\right) dx =$

  • A
    $\frac{\pi}{2}$
  • B
    $\pi$
  • C
    $\frac{2\pi}{3}$
  • D
    $2\pi$

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જો $f$ અને $g$ એ $[0, a]$ માં સતત વિધેયો હોય જે $f(x) = f(a - x)$ અને $g(x) + g(a - x) = 4$ નું સમાધાન કરે છે,તો $\int_{0}^{a} f(x) g(x) dx$ ની કિંમત શોધો.

જો $\int_{-1}^{4} f(x) dx = 4$ અને $\int_{2}^{4} (3 - f(x)) dx = 7$ હોય,તો $\int_{2}^{-1} f(x) dx$ ની કિંમત શોધો.

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