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\int_{}^{} 3 \sin 3 x \cos 4 x d x

এর মান কত?

\frac{14}{3} (7 \cos x - \cos 7 x)

\frac{3}{14} (7 \sin x - \sin 7 x)

\frac{1}{12} (7 \cos x - \cos 7 x)

\frac{3}{14} (7 \cos x - \cos 7 x)

ANS : 2

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