I understand that I have to use u-substitution on one of the terms but I don't see which one.

I really have tried to solve this. I'm self-studying and hence have no real other recourse. I have searched the forum/google for similar problems but to no avail. Thanks and hello.

$\displaystyle \int\frac{x\sin\sqrt{2x^2-5}}{\sqrt{2x^2-5}}dx$