Formula_9275

\[\begin{gathered}Y_{00}=(4 \pi)^{-1 / 2}, \quad Y_{10}=\left(\frac{3}{4 \pi}\right)^{1 / 2} \cos \vartheta, \\Y_{1, \pm 1}=\mp\left(\frac{3}{8 \pi}\right)^{1 / 2} \sin \vartheta e^{ \pm i \varphi},\end{gathered}\]