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Mathematics 14 Online
OpenStudy (anonymous):

Hello, I'm really stuck on this im an engineer i have been asked to find whether the following signals are periodic, if yes find the period, the functions are as follows 1) x(t) = cos(2t+pi/4) 2) x(t) = (cos^2)*t 3) x(t) = u(t)cos2*pi*t Does anyone have a method to solve these and can you go through it please?

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