How do I write $\sin(2)$ as an expansion of spherical harmonics?

Question

I've been given a wave function, $\psi = f(r)\sin(2)$, and told to rewrite it as a summation of spherical harmonics. All of the spherical harmonics seem to be written with a $\theta$ dependence so I'm unsure of how to proceed getting this into spherical harmonics beyond writing $\sin(2)$ as $2(\sin()\cos())$.