This program was written using the simple Python GUI module, pygame. It also utilizes the math module from the Python standard library.
Simple program that is designed to show how the trigonometric functions sin and cos are related to the unit circle. The yellow circle on the x-axis corresponds to cos(theta), the yellow circle on the y-axis corresponds to sin(theta), and the line between them creates the angle theta. The red ball is always at the x coordinate of the horizontal yellow ball and the y coordinate of the vertically moving yellow ball.