Two waves are described by: y, =10 sin{(8TIX - 400nt)] ; y, = 12 sin [ 8 TIX - 400 wit) - TT/6] where y, y, and x are in metres and t in seconds. When these two waves are combined, a new travelling wave is produced. A phasor diagram is used to determine the amplitude of the resultant wave. The vertical component of the amplitude of y? is: A. 10 sin 60 B. 12 sin 30 C. 10 cos 60 D. 12 cos 30 O 12 sin 30 10 sin 60 10 cos 60 12 cos 30