1.

\({{\rm{I}}_{\rm{m}}} = \mathop \smallint \nolimits_0^{\rm{\pi }} \frac{{\sin 2{\rm{mx}}}}{{\sin {\rm{x}}}}{\rm{dx}}\) is equal to?

A. 0
B. 1
C. m
D. 2 m
Answer» B. 1


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