(adsbygoogle = window.adsbygoogle || []).push({}); forgot how to integrate!! yes! t*cos(Pi*t)

Hello everyone i'm integrating a position vector and i'm stuck on integrating the j unit. t*cos(Pi*t);

the answer i got with maple is:

1/Pi^2*(cos(Pi*t)+Pi*t*sin(Pi*t))

but i have no idea how maple busted that out.

if i let u = cos(Pi*t);

du = sin(Pi*t)*Pi dt;

1/Pi du = sin(Pi*t);

but i don't see how this is helping me any...

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# Homework Help: Forgot how to integrate yes! t*cos(Pi*t)

**Physics Forums | Science Articles, Homework Help, Discussion**