Make up the derivation of Eq. (8.4) Wrect (@p) +2 ΣWrect(t)e-ipt = e-ipT(N-1)/2N sin(@pT/2) sin(@pT/2N) (8.4) k=0 for DFT of rectangular window by using the formula for the sum of a geometrical series with the first term of 1 and a geometric ratio of e-ipT/N. Then, plot the DFT.

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