જો $f(x)$ એ $x$ નું અયુગ્મ વિધેય હોય,તો $\int_{ - \frac{\pi }{2}}^{\frac{\pi }{2}} {f(\cos x)\,dx} $ ની કિંમત શું થાય?

  • A
    $0$
  • B
    $\int_0^{\frac{\pi }{2}} {f(\cos x)\,dx} $
  • C
    $2\int_0^{\frac{\pi }{2}} {f(\sin x)\,dx} $
  • D
    $\int_0^\pi {f(\cos x)\,dx} $

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