(Solution Library) The problem is an applications of the trigonometric identities sin A sin B=1/2[ cos (A-B)- cos (A+B)] , sin A cos B=1/2[ sin (A-B)+ sin
Question: The problem is an applications of the trigonometric identities
\[\begin{aligned} & \sin A\sin B=\frac{1}{2}[\cos (A-B)-\cos (A+B)] \\ & \sin A\cos B=\frac{1}{2}[\sin (A-B)+\sin (A+B)] \\ & \cos A\cos B=\frac{1}{2}[\cos (A-B)+\cos (A+B)] \\ \end{aligned}\]
Find \[\int{\sin }2x\sin 4xdx\]
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