Difference between revisions of "Cosine"
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| − | '''Cosine''' is a [[ | + | '''Cosine''' is a [[trigonometric function]] describing the [[ratio]] of the adjacent side to the [[hypotenuse]] in a [[right triangle]]. It is often abbreviated ''cos''. |
<math>\cos \theta = \sin \left(\frac{\pi}{2} - \theta \right) = \frac{1}{\sec \theta}\,</math> | <math>\cos \theta = \sin \left(\frac{\pi}{2} - \theta \right) = \frac{1}{\sec \theta}\,</math> | ||
[[Category:Mathematics]] | [[Category:Mathematics]] | ||
Revision as of 06:36, October 22, 2008
Cosine is a trigonometric function describing the ratio of the adjacent side to the hypotenuse in a right triangle. It is often abbreviated cos.
<math>\cos \theta = \sin \left(\frac{\pi}{2} - \theta \right) = \frac{1}{\sec \theta}\,</math>