Trig Graph Simulator This is a basic simulation of how a trigonometric graph (sin, cos, or tan) is created from a unit circle. Coded in Python 3.6 with the Pygame library.

The graph of y = tan θ As the point P moves anticlockwise round the circle, the values of cos θ and sin θ change, therefore the value of tan θ will change. This graph has a period of 180°.

Pages Sin, cos and tan Before we can use trigonometric relationships we need to understand how to correctly label a right-angled triangle.