integrate : sin(mx)cos(mx) (1 Viewer)

[underthesun]

i just forgot what's the most effective way to do it?

when either n or m is odd, it's kind-of confusing..

example :

integrate : sin(5x)cos(3x)dx

 

[spice girl]

Originally posted by underthesun
i just forgot what's the most effective way to do it?

when either n or m is odd, it's kind-of confusing..

example :

integrate : sin(5x)cos(3x)dx

easiest way is to recognise that sin(5x)cos(3x) = 1/2(sin8x + sin2x)

 

[underthesun]

argh.. just remembered that double angle stuff

thanks alot anyways