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#### aNxello

##### New member

- Feb 20, 2013

- 13

**[SOLVED] Fourier Series Involving Hyperbolic Functions**

Hello everyone!

Sorry if this isn't the appropriate board, but I couldn't think of which board would be more appropriate. I was running through some problems I have to do as practice for a test and I got stuck on one I'm 99% sure they'll ask in the test, in some way or another, and I can't figure it out. This isn't homework, and I'm not asking for you guys to do it for me, but I would love some help to get through it!

Anyways, the problem is simple, I have to expand the function f(x) = cosh(ax) where a is a real number, in a fourier series over the interval (-pi, pi)

I've started to calculate the coefficients, but they don't seem to be able simplify. I found this online but I can't get to the that answer.

Any help/tips? I'd really appreciate it!

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