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Definition Fourier series

\(\begin{flalign*} & f(t) = \sum^\infty_{-\infty}c_ne^{jn\omega t} && \end{flalign*}\)

Formula of Fourier coefficient

\(\begin{flalign*} c_n = \int^{t_0+T}_{t_0}f(t)e^{-jn\omega t}dt && \end{flalign*}\)

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