definite-integral

Question: The value of the integral $\int_{-\pi }^{\pi }{\sin mx\sin nx\,dx}$ for $m\ne n$ $(m,\,\,n\in I),$ is



1) 0
2) $\pi $
3) $\frac{\pi }{2}$
4) $2\pi $
Solution: Explanation: No Explanation
Fundamental definite integration Definite integration by substitution

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