Tracing cosine curve .

Trace the cosine curve using a Unit Circle by having the trace on then moving point C on the circle.
The circle with centre A is a unit Circle. The coordinates of any point C on it are (cos BAC, sin BAC) By plotting the valuse taken by the angle BAC on the X axis and Plotting the valuse taken by cos of angle BAC, i.e x coordinate of C on the Y axis We get the curve for the function y =cos x as takes values from 0 to 2 pi.