The functions describing the horizontal and vertical positions of a point on a Circle as a function of Angle
(Cosine and Sine) and those functions derived from them:

(1) | |||

(2) | |||

(3) | |||

(4) |

The study of circular functions is called Trigonometry.

**References**

Abramowitz, M. and Stegun, C. A. (Eds.). ``Circular Functions.'' §4.3 in
*Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, 9th printing.*
New York: Dover, pp. 71-79, 1972.

© 1996-9

1999-05-26