Let

$\displaystyle h(\theta, \phi)= 1 + sin\phi sin\theta$

By taking linear combinations of these spherical harmonics, find A_{nm}for all n

and m such that

$\displaystyle h(\theta, \phi)=\sum^{1}_{n=0}\sum^{n}_{m=-n} A_{nm}Y^{m}_{n}(\theta, \phi)$

Where $\displaystyle Y^{m}_{n}(\theta, \phi)$ is the first few spherical harmonics.

Any and All help is appreciated