$m, n \in \mathbb{Z}$ માટે $\int_0^{2 \pi} \cos m x \cos n x \, dx + \int_{-\pi}^\pi \sin m x \cos n x \, dx$ ની કિંમત શોધો.

  • A
    $0$,જો $m \neq n$
  • B
    $\pi$,જો $m = n \neq 0$
  • C
    $2\pi$,જો $m = n$
  • D
    $\pi/2$,જો $m = n$

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