From our discussions it is apparent that an LTI system cannot produce frequencies at its output that are different from those applied in its input. Thus, if a system creates "new" frequencies, it must be nonlinear and/or time varying. Determine the frequency content of the outputs of the following systems to the input signal
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![988_d2cd754a-37f9-49d0-8138-3ef0e2b1cf26.png](https://secure.tutorsglobe.com/CMSImages/988_d2cd754a-37f9-49d0-8138-3ef0e2b1cf26.png)