Electromagnetic wave in a vacuum:
E=(1.3i + 2.6j + Ak) (10^2 V/m) e^i[(2.1x + Cy + 2.1z) 10^7 m^-1 - Dt]
B=(-7.5i + Bj + 7.5k) (10^-7 T) e^i[(2.1x + Cy + 2.1z) 10^7 m^-1 - Dt]
Find A,B,C,D
Not too sure how to approach, but since both have to be perpendicular to propagation should A...