Unit circle - Animation-II
Helping you to understand COSINE
Above you see the unit circle. It has a radius equal 1. Below it, the plot of the cosine function, where the value of π (Pi) is assumed to be 3.14 , which provides the value of the cosine of the angle described on the unit circle, by the moving ball.
The cosine is the projection of the position of the ball on the X-axis. For instance, when the angle described is 0 degrees , the cosine is 1 . The cosine graph is in RADIANS, so that the angles represented on the x-axis are: π /2 (90 degrees), π (180 degrees) and so on.
The sine is the projection of the position of the ball on the Y-axis.
The animation for the sine function>>