Compute causal function using integration by parts

AI Thread Summary
The discussion focuses on using integration by parts to solve a specific integral involving the function T.sin3(t-T). Participants seek clarification on the steps taken to transition from one line of the equation to the next. The importance of correctly applying the integration by parts method is emphasized, as it is crucial for obtaining the correct result. Additionally, there is a mention of convolution details, indicating that some participants may need to refresh their knowledge on that topic. Overall, the thread highlights the challenges and necessary techniques involved in solving the integral.
majdi
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Homework Statement


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I stuck on, when the question as for integration by parts method. Need advice
 
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Hi majdi. http://img96.imageshack.us/img96/5725/red5e5etimes5e5e45e5e25.gif

The line with ∫ T.sin3(t-T).dT is where you need to perform integration by parts, in order to get the next line.

How did you go from that line to the next? (BTW, that is the right answer after you evaluate that integral).

NB: I have forgotten convolution details, so I'm making no comment on your post before the integral by parts line.
 
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