The sine curves y1 = 30 sin( 6t - 1) and y2 = 30 sin 6t - T have the same period. (a) Find the phase of each curve. y1 phase y2 phase (b) Find the phase difference between y1 and y2. (c) Determine whether the curves are in phase or out of phase. O in phase O out of phase (d) Sketch both curves on the same axes. y1 y2