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

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Mike Trainor

Posts: 28
Registered: 4/21/13
Re: Help with identity
Posted: May 9, 2013 7:13 AM
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On Wed, 08 May 2013 08:29:45 +0200, AP
<marc.pichereau@wanadoo.fr.invalid> wrote:

>On Thu, 25 Apr 2013 08:17:47 -0400, Mike Trainor
><mtrainor@hotmail.com> 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)]

>not
>1+2sum{n, 1, inf} [exp(-nx)*cos(ny)]
>?


You are right. Antoher typo!

mt



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