[Newbie] fourier series



I'd like Maxima to calculate the fourier series of the following function 
with period T:
f(t)=(-A/t1)*t+A for 0<t=<t1
f(t)=0 for t1<t=<T

I looked in the manual and mailing list for examples but couldn't derive
how to calculate the desired fourier series coefficients

any help welcome

hugo