magnitude spectrum of sin and square waves

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Group 1
Group 1 on 22 Dec 2016
Hello, i want to design a 3rd order low pass butterworth filter. my cutoff frequency= 160 rad/s, the input signal is a square wave with magnitude -+1V and fundamental frequency of 130 rad/s. How can i plot the magnitude spectrum of the input x(w) and the output signal y(w)?

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