$\int_0^{\pi /4} {\frac{{4\sin 2\theta \,d\theta }}{{{{\sin }^4}\theta + {{\cos }^4}\theta }}} = $

  • A
    $\pi /4$
  • B
    $\pi /2$
  • C
    $\pi $
  • D
    આમાંથી કોઈ નહીં

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