समाकल $\int_{-\pi}^{\pi} (\cos ax - \sin bx)^2 dx$ का मान,जहाँ $a$ और $b$ पूर्णांक हैं,ज्ञात कीजिए।

  • A
    $-\pi$
  • B
    $0$
  • C
    $\pi$
  • D
    $2\pi$

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