integral 0 to infinite (x^ 3)(e^-8x) cos(5x) dx

should I do integrate by part?

help me (Worried)

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- Oct 22nd 2010, 09:17 PMddcampIntegration by parts? help plz
integral 0 to infinite (x^ 3)(e^-8x) cos(5x) dx

should I do integrate by part?

help me (Worried) - Oct 22nd 2010, 09:49 PMEducated
Please use brackets.

Is it:

Or is it: - Oct 22nd 2010, 11:47 PMddcamp
1st one. ! thanks. how did you do it?

- Oct 23rd 2010, 01:00 AMEducated
To type equations like I did, you use LaTeX to do it. LaTeX Tutorial.

Yes, you would use integration by parts. For the part you would also need to use integration by u-substitution as well as integration by parts.

- Oct 23rd 2010, 05:25 AMskeeter
- Oct 23rd 2010, 12:41 PMddcamp
I have to find the actual value :S :S thanks!