How do i integrate SinxCosX by parts?

I am stuck

Printable View

- Apr 18th 2013, 02:03 PMBenja303Integration trig help
How do i integrate SinxCosX by parts?

I am stuck - Apr 18th 2013, 02:22 PMPlatoRe: Integration trig help
- Apr 18th 2013, 02:27 PMBenja303Re: Integration trig help
-1/2 cos^2(x)?

BTW how do i know when to use parts or not? - Apr 18th 2013, 02:34 PMPlatoRe: Integration trig help
- Apr 18th 2013, 03:29 PMBenja303Re: Integration trig help
? what other way can u do it?

- Apr 18th 2013, 03:31 PMProve ItRe: Integration trig help
Plato is right that using Integration by Parts here is overkill, but if you MUST use it...

I personally prefer to avoid integration by parts where possible. This is easier integrated if you change the integrand using a double angle formula.

As you can see, these answers differ only by a constant, and since the constants are arbitrary anyway, they can be considered to be equivalent :) - Apr 18th 2013, 04:09 PMBenja303Re: Integration trig help
I was not taught these double angle things. Can u give me some insight?