Can anyone give me the proof or point me to a link to derive this First Integral of Bessel's Function.(adsbygoogle = window.adsbygoogle || []).push({});

[tex]J_n(x)=\frac{j^{-n}}{\pi}\int_0^{\pi}\cos(n\phi)e^{jx\cos \phi}d\phi[/tex]

I have been searching all over and can't find the derivation. In fact, other than some basic Bessel's identities that is shown in one PDE book, I have yet to find anything.

Thanks

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# Need information in deriving first integral of Bessel's function.

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