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Find the Fourier series expansion for x(t) = | cos(nt/2)|. Determine the Fourier transform of the signal x(t) shown below which consists of three rectangular

Find the Fourier series expansion for x(t) = | cos(nt/2)|.

Determine the Fourier transform of the signal x(t) shown below which consists of three rectangular pulses. (Note: this is not a periodic function.) 

Use the duality property of the Fourier transform to find the Fourier transform of x(t) = sinc(Wt). r r

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