Before you press the green flag, move the sliders at the top to change general settings, and at the bottom you can choose which lines you want to appear, (0 is don't appear, 1 is do appear). When you press the green flag, the lines will be drawn according to your settings. When you press the stop button, after 5 seconds, the sliders will reappear.
Blue is tangent, green is cosine, red is sine. Yellow is an abs of tangent, above y=0 is positive, and below is negative.
