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Bessel's First Integral


\begin{displaymath}
J_n(x)={1\over\pi} \int_0^\pi \cos(n\theta-x\sin\theta)\,d\theta,
\end{displaymath}

where $J_n(x)$ is a Bessel Function of the First Kind.




© 1996-9 Eric W. Weisstein
1999-05-26