integral( e^x*sin x*cos x*cos 2x*cos 4x) dx
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Use $\displaystyle \sin (2a)=2\sin a\cos a$ to simplify the function, then integrate by parts.
Originally Posted by prat integral( e^x*sin x*cos x*cos 2x*cos 4x) dx Hint: $\displaystyle \sin(\alpha)\cos(\alpha)=\frac{1}{2}\sin(2\alpha)$ Use this identity 3 times then integrate!
what will we do of e^x can yu show me some steps
Have you done the simplification? What did you get?
Originally Posted by prat what will we do of e^x can yu show me some steps From post #2: "then integrate by parts". And I endorse the sentiments expressed in the previous: "Have you done the simplification? What did you get?"
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