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I need to find the Fourier series of the $f(t) = e^{jxt}$ , $− \pi < t < \pi$ What will be the first step to solve it?

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There is no need for you to find Fourier series just compare with equation $x(t)=\sum_{-\infty}^{+\infty}C_n*e^{j*w_n*t}$ we will know $C_n,w_n.$

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