निश्चित समाकलन $\int \limits_0^{\pi / 2} \frac{\sin x \cos x}{1+\cos ^4 x} d x$ का मान क्या है?

  • A
    $\frac{\pi}{8}$
  • B
    $\frac{\pi}{4}$
  • C
    $1$
  • D
    $2$

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