$m \neq n$ $(m, n \in I)$ માટે સંકલન $\int_{-\pi}^{\pi} \sin(mx) \sin(nx) \, dx$ ની કિંમત શું છે?

  • A
    $0$
  • B
    $\pi$
  • C
    $\frac{\pi}{2}$
  • D
    $2\pi$

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