This lesson shows how to draw the graph of y = sin2x. The period of y = sin2x is pi. half period is pi/2. quarter period is pi/4. Three-quarter period is 3pi/4. when x = 0, y = 0, which is the intercept point. When x is the half period, y = 0. (the point which make y = 0 is the intercept point.) When x is the quater period, y is the maximum which is positive one. When x is the three-quarter period, y is the minimum which is negative one. When x is full period, y is back to 0 which is the start point. The graph of y = six2x will repeat in every pi interval. Note the difference of the graph between y = sin2x and y = sin x.