I'm trying to do the following:
$$\int \cos(wt)w\sin(wt+\phi) \,\mathrm{d}t$$
I can't figure what to do here. I can't do integration by parts because of the $\phi$. Any ideas?
I'm trying to do the following:
$$\int \cos(wt)w\sin(wt+\phi) \,\mathrm{d}t$$
I can't figure what to do here. I can't do integration by parts because of the $\phi$. Any ideas?