I have this expression $$(-Ax\sin(xt) + Bx\cos(x t))\times|-Ax\sin(x t) + Bx\cos(x t)| = 0.$$
I try to recast it in terms of a simple function of $\cos(x t)$ and $\sin(x t)$. The absolute value blocks me and I don't know what to do with it.
Thank you for your advice!