For an even function, the Fourier series is given by:
\[f(t) = a_0 + \sum_{n=1}^{\infty} [a_n \cos(n \omega_0 t) + b_n \sin(n \omega_0 t)]\]
where \(a_0\), \(a_n\) and \(b_n\) are the Fourier coefficients, and \(\omega_0 = \frac{2\pi}{T}\) is the fundamental
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