P.6-15 The magnetic field intensity of an electromagnetic wave H(R. () = at Ho cos (ot - kR) (A/m) is the sum of H,(R. () = a 10 * sin (of - kR) (A/m) and H,(z. 1) = a, 2 x 10 *cos(wt - KR + x) (A/m).1. a) Problem 6.15 (page 271, note: treat kR term like part of the phase and find the exponential form first), b) convert 12e By cos(wt -y)a into phase form, c) convert 2je yay + ely-Jya, into a time varying function with w= 10 0. (10 points)