Hi, I want to calculate the Fourier series expansion of

f(x)= a sin(x) / (1-2 a cos(x) + a^2), where |a|<1 and -pi < x <pi,

but I cannot integrate the function "cos(nx) f(x)". Is there a trick for this integration. Thanks.

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- Mar 4th 2010, 02:43 AMGaudiumIntegration to find the Fourier coefficients
Hi, I want to calculate the Fourier series expansion of

f(x)= a sin(x) / (1-2 a cos(x) + a^2), where |a|<1 and -pi < x <pi,

but I cannot integrate the function "cos(nx) f(x)". Is there a trick for this integration. Thanks. - Mar 4th 2010, 10:22 PMCaptainBlack