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f(t)=a_0+\sum_{n=1}^{\infty}(a_n\cos(2\pi nt/T)+b_n\sin(2\pi nt
\int_{0}^{T}\cos(2\pi nt/T)\cos(2\pi mt
\int_{0}^{T}\cos(2\pi nt/T)\sin(2\pi mt
\int_{0}^{T}\sin(2\pi nt/T)\sin(2\pi mt
\log\frac{1+x}{1-x} = x + x^3/3 + x^5