Fourier series with general formula

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I have this graph with a Fourier series, but I don't know how to resolve this with the general function

$$ X(t) = \frac{a_0} 2 + \sum_{i=1}^n a_n \cos(n\omega t) + \sum_{i=1}^n b_n \sin(n\omega t) $$

Fourier serie