So e = 170 cos (120πt - π/3)

Amplitude is 170 V.

Period = 2π/b = 2π/120π =1/60 = 0.016667

Phase shift = -c/b = - (-π/3)/120π = 1/360 = 0.0027778

So our cosine curve will be shifted to the right by approximately 0.0028 seconds.