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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*30*t)*sin(2*pi*90*t)+cos(2*pi*150*t)*sin(2*pi*210*t)
cos(2*pi*30*t)^2*sin(2*pi*60*t)^3
sin(2*pi*30*t)+cos(2*pi*90*t)+sin(2*pi*150*t)+cos(2*pi*210*t)
cos(2*pi*30*t)^3*sin(2*pi*60*t)^2
cos(2*pi*30*t)+sin(2*pi*90*t)+cos(2*pi*150*t)+sin(2*pi*210*t)
cos(2*pi*30*t)^2*sin(2*pi*60*t)^2
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