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I have to show:

Should I try to find the fourier series from -2pi to 2pi? I have tried this already but I can't seem to get rid of the cos(nx/2) and sin(nx/2) to turn them into just sin(nx) and cos(nx) and the denominator stays as (n^2+4 instead of n^2+1.

Any suggestions would be very helpful.

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# Fourier series (maybe) of e^x from 0 to 2pi

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