5.23. Let X(ej) denote the Fourier transform of the signal x[n] depicted in Figure P5.23. Perform the following calculations without explicitly evaluating X(ej"): (a) Evaluate X(ejo). (b) Find XX(ej"). (c) EvaluateX(ejw)dw. (d) Find X(ej"). (e) Determine and sketch the signal whose Fourier transform is Re{x(w)}. (f) Evaluate: (i) X(e)dw πT dX(ejw) (ii) dw TT dw -3 x[n] 2 „ılıılı. -2-1 0 1 2 3 4 5 6 -10 Fig P5.23 7 8 n