Q: Integration of e^(-t/2)cos(n2t)dt

1. Nov 14, 2007

Peter_L

Hello everyone,

I haven't done calculus in a long time now and i've been reviewing some old calc books but couldnt' find anything that helps. Was wondering how to integrate this function:

e^(-t/2)cos(n2t)dt

I was thinking of using the u substitution technique but can't find a substitute for u. Any help would be fantastic.

Thanks.

2. Nov 14, 2007

Peter_L

Limits are from 0 to pi

Limits are from 0 to pi

3. Nov 14, 2007

sutupidmath

well from what i can see here, i havent tried it myself though, so i might be wrong, but it is worth a try. integration by parts i think would work here. let u=e^-(t/2), and v=integ of cos(n2t)dt, and applying integration by parts twice i think you might get something.
sorry for not having time to do it myself first.