how to plot Fourier transform of several functions in the same plot

how to plot Fourier transform of several functions in the same plot

I want to plot the fourier transform of a function. I wrote down this: t0:10 g-1exp-tt-1; g1fftg; x-2:0.01:2; plotx,absg1 It turned out no plot and there is no errors reported. May I ask where the errors are Thank you.

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