Value of Anger at 0
From specialfunctionswiki
Theorem: The following formula holds: $$\textbf{J}_{\nu}(0)=\dfrac{\sin(\pi \nu)}{\pi \nu},$$ where $\textbf{J}_{\nu}$ denotes the Anger function, $\sin$ denotes the sine, and $\pi$ denotes pi.
Proof: █
