यदि $f(x)=\sin ^6 x+\cos ^6 x+2 \sin ^3 x \cos ^3 x$ है, तो $\int_0^{\pi / 4} \frac{\sin ^2 2 x}{f(x)} d x=$

  • A
    $2$
  • B
    $\frac{2}{3}$
  • C
    $\frac{-2}{3}$
  • D
    $\frac{1}{6}$

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