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Plot the Fourier series

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For the function:

f(x) = x; -L < x < L
f(x+2L) = f(x); - ? < x < ?

Plot the original function for -3L < x < 3L, and then also plot the Fourier series for values of n up to n = 1, 2, 3, 4, 5, 10, 20, 50. There should be a total of 9 curves including the original.

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