Please help I am stuck
evaluate the following intergral
x cos 15x dx.
use integration by parts
u = x, du = dx
dv = cos 15x dx, v = 1/15 sin 15x
Now we have
∫x cos15x dx = 1/15 x sin15x - ∫1/15 sin15x dx
And that's clear sailing. . . right?