Given a wave with E = xE0cos (wt – kz) Calculate: (a) The

Given a wave with E = xE0cos (wt – kz) Calculate:
(a) The time-average electric energy density

(b) The time-average magnetic energy density (wm)av = 1/T f wm dt = 1/2T f ÂľH2 dt, and
(c) Show that (we) av = (wm)av.