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\frac{1}{T}\int_{0}^{T}f(t)g(t)dt
f(t)=a_0+\sum_{n=1}^{\infty}(a_n\cos(2\pi nt/T)+b_n\sin(2\pi nt/T))
f(t)=\sum_{n=0}^{\infty}(a_n\cos(2\pi nt/T)+b_n\sin(2\pi nt/T))
a_n=\frac{1}{T}\int_0^Tf(t)\cos(2\pi t/T)dt
b_n=\frac{1}{T}\int_0^Tf(t)\sin(2\pi t/T)dt