यदि $\int_0^\pi {x\,f({{\cos }^2}x + {{\tan }^4}x)\,dx} = k\int_0^{\pi /2} {f({{\cos }^2}x + {{\tan }^4}x)\,dx,}$ तो $k$ का मान ज्ञात कीजिए।

  • A
    $\frac{\pi }{2}$
  • B
    $\pi $
  • C
    $-\frac{\pi }{2}$
  • D
    इनमें से कोई नहीं

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