$\int_0^\pi {\left| {\,{{\sin }^4}x\,} \right|\,dx} $ का सही मूल्यांकन क्या है?

  • A
    $\frac{{3\pi }}{8}$
  • B
    $\frac{{2\pi }}{3}$
  • C
    $\frac{{4\pi }}{3}$
  • D
    $\frac{{8\pi }}{3}$

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