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On observe ci-dessous le spectre d’un signal périodique.
Quel signal temporel a produit ce spectre via la FFT ?
cos(2*pi*10*t)+cos(2*pi*30*t)
cos(2*pi*20*t)*cos(2*pi*40*t)
cos(2*pi*10*t)^3
cos(2*pi*10*t)*cos(2*pi*30*t)
cos(2*pi*20*t)+cos(2*pi*40*t)
cos(2*pi*20*t)^4
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