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How to periodize a rectangular pulse?
Hint: Use paper and pencil and graph paper to sketch the signals $u_3(t)$, $u_3(t-T_i)$, and $u_3(t)+u_3(t-T_i)$, Notice how the righthand pulse of $u_3(t)$ which starts at $t=\frac{T_i}{4}$ and ends ...
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