ધારો કે $f:R \to R$ અને $g:R \to R$ સતત વિધેયો છે,તો સંકલન $\int_{-\pi/2}^{\pi/2} [f(x) + f(-x)][g(x) - g(-x)] \, dx$ ની કિંમત શોધો.

  • A
    $ \pi $
  • B
    $ 1 $
  • C
    $ -1 $
  • D
    $ 0 $

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$\int_0^{\pi / 2} \frac{\cos x}{3 \cos x+\sin x} d x=$

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