Last modified on December 8, 2008, at 12:19

Cosine

Cosine is a trigonometric function describing the ratio of the adjacent side to the hypotenuse in a right triangle. It is often abbreviated cos.

x values y values
0 1
π/2 0
π -1
3π/2 0
1
Cosine-pi.jpg

radians is equivalent to one circle. The graph continues in that pattern.

Relation to secant