(Solved): The angular part of the normalized wavefunction used to describe a 2p atomic orbital is 2p() ...

The angular part of the normalized wavefunction used to describe a $2p$ atomic orbital is ${?}_{2p}(?)=\sqrt{\frac{3}{2}}\cos ?$. What fraction of the electron charge will be found between ${?}_1=60^{?}$ (or $?/3$ ) and ${?}_2=120^{?}$ (or $2?/3$ )? Note that your "volume" element here is in terms of angle $?$, so whereas in a particle in a $1\mathrm{D}$ box your "volume" element is simply $dx$, here you will get your first experience working with spherical coordinates, where your "volume" element for $?$ is $\sin ?d?$.