$\int_{0}^{20\pi} (\sin^4 x + \cos^4 x) dx$ का मान किसके बराबर है?

  • A
    $\frac{15\pi}{2}$
  • B
    $25\pi$
  • C
    $15\pi$
  • D
    $\frac{25\pi}{2}$

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