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Also:

sage: maxima('load(fourie)')

sage: maxima('foursimp(fourier(x^3,x,%pi))')

[%t26,%t27,%t28]

sage: maxima('[%t26,%t27,%t28]')

[a[0]=0,a[n]=0,b[n]=-2(%pi^2n^2-6)*(-1)^n/n^3]