Fourier series (triangle signal)

Something does not work for me to write this code in scilab because it does not look like a Fourier series (triangle signal) I can ask for help in writing this formula?

Scilab 13-11-21, 5:32 p.m. megal21x
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18-11-21, 3:28 p.m. William9688

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18-11-21, 10:53 p.m. schroededa

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21-03-22, 7:58 p.m. geebranz

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