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

The value of the integral \[\int_{-\pi }^{\pi }{\sin mx\sin nx\,dx}\]

1.	The value of the integral \[\int_{-\pi }^{\pi }{\sin mx\sin nx\,dx}\] for \[m\ne n\] \[(m,\,\,n\in I),\] is
A.	0
B.	\[\pi \]
C.	\[\frac{\pi }{2}\]
D.	\[2\pi \]
Answer» B. \[\pi \]

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

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