Consider a real, anticausal sequence x[n] with DTFT X(ejω). The real part of X(ejω) is...

Consider a real, anticausal sequence x[n] with DTFT X(e^jω). The real part of X(e^jω) is

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