Find: Substitution won't help, and integration by parts doesn't get seem to get you anywhere Thanks.
Follow Math Help Forum on Facebook and Google+
Originally Posted by DivideBy0 Find: Substitution won't help, and integration by parts doesn't get seem to get you anywhere Thanks. ah, but a combination works! Note that, Let So our integral becomes: and integration by parts works on that guy Also: i haven't tried this, but maybe using series can work. do you know the power series for sin(x)? perhaps you could do term by term integration
Parts will work. You just have to apply it twice. Let Then you get: Now, for the integral on the right: Let Then we get: Add to both sides:
Thanks, I thought parts wouldn't work because for some reason I was trying to integrate u instead of differentiate it. But i guess now it does work
Yes, sometimes it's easy to overlook what I call "cyclic IBP's". Those are the ones when you use parts you end up with the integral you started with. Then when you add it to both sides, you can divide by 2, 4, whatever and voila.
View Tag Cloud