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    ow do yu intedrate th8s

    cos(4x)e^(3x)
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    Hi Joe,

    Ok now the whole point of this forum is to aid people, and to guide them to the correct answer. We expect people to have at least tried to work out the answer, and then post thier working so far, and what issues they have. Now if you would like to go and have a go at working out the answer, and then post at least some attempt, and where you are having problems, then we will be more than willing to help, but to expect any help when you have written two lines in txt speeak is wholy selfish. So post back with a more sensible reply if you would like help
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    Use integration by parts twice. If you write I = \displaystyle \int \cos 4x e^{3x}\, dx and use u = e^{3x} (and let \frac{dv}{dx} be whatever's left) both times, then you end up with I on both sides of the equation; then you just solve for I. Also, what Galadirith said.
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    kthxbye
 
 
 
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