a. Copy and complete the table for the relation y = 2cos2x - 1

x	0º	30º	60º	90º	120º	150º	180º
y = 2cos 2x - 1	1.0	0					1.0

b. Using a scale of 2cm = 30º on the x - axis and 2cm = 1 unit on the y - axis, draw the graph of y = 2cos2x - 1 for 0º ≤ x ≤ 180º

c. On the same axes, draw the graph of y = \(\frac{1}{180}\)(x - 360)

d. Use your graphs to find the values of x for which 2cos2x + \(\frac{1}{2}\) = 0