જો $\int_{ - a}^a {\sqrt {\frac{{a - x}}{{a + x}}} \,dx = k\pi ,} $ હોય,તો $k = $

  • A
    $ - a$
  • B
    $ - 2a$
  • C
    $2a$
  • D
    $a$

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ધારો કે $f(x)$ એવું વિધેય છે જે $f(x) + f(\pi - x) = \pi^2, \forall x \in R$ નું સમાધાન કરે છે. તો $\int_{0}^{\pi} f(x) \sin x \, dx$ ની કિંમત $...........$ છે.

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