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Input:
fourier(x)
Write:
`fourier(x)`
Compute:
$$fourier(x)$$
Output:
$$fourier(x)== 2\ sin(x)+\frac {((\frac{-1}{2})\ \pi -\frac{1}{2}\ cos((-2)\ \pi )\ \pi )}{\pi }\ sin(2\ x)+\frac {((\frac{-1}{3})\ cos((-3)\ \pi )\ \pi -\frac{1}{3}\ cos(3\ \pi )\ \pi )}{\pi }\ sin(3\ x)$$
Result: $$2\ sin(x)+\frac {((\frac{-1}{2})\ \pi -\frac{1}{2}\ cos((-2)\ \pi )\ \pi )}{\pi }\ sin(2\ x)+\frac {((\frac{-1}{3})\ cos((-3)\ \pi )\ \pi -\frac{1}{3}\ cos(3\ \pi )\ \pi )}{\pi }\ sin(3\ x)$$
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