Consider a real, anticausal sequence x[n] with discrete-time Fourier transform X(e^j?). The real part of X(e^j?) is Find XI(ej?), the imaginary part of X(ej?). (Remember that a sequence is said to be anticausal if x[n] = 0 for n > 0.)

Find X_I(e^j?), the imaginary part of X(e^j?). (Remember that a sequence is said to be anticausal if x[n] = 0 for n > 0.)

XR(e") =(1/2)*cos(ka). k-0