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Topic: Help with identity
Replies: 15   Last Post: May 9, 2013 7:13 AM

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Registered: 1/6/11
Re: Help with identity
Posted: May 8, 2013 2:45 AM
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In article <>,
AP <> wrote:

> >Would greatly appreciate any pointers to proving the following
> >identity that I came across in Bateman's book on partial
> >differential equations:
> >
> >sinh(x)/(cosh(x) - cos(y) = 1 +
> >
> > sum{n, 1, inf} [exp(-nx)*cos(ny)]

sinh(x)/(cosh(x) - cos(y) =

should be

sinh(x)/(cosh(x) - cos(y) ) =

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