$\int_a^{a + (\pi /2)} (\sin^4 x + \cos^4 x) \, dx$ का मान है

  • A
    $a$ से स्वतंत्र
  • B
    $a \left( \frac{\pi}{2} \right)^2$
  • C
    $\frac{3\pi}{8}$
  • D
    $\frac{3\pi a^2}{8}$

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