# Difference between revisions of "Cosine"

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+ | [http://www.bookofproofs.org/branches/cosine/ read more about cosine on Bookofproofs] |

## Revision as of 15:04, 6 March 2016

Geometrically, the cosine is a projection of the complex number exp(−ix) to the real axis. The behavior of the cosine function can be studied in the following interactive figure, where you can drag the point x and observe the behaviour of the complex number exp(−ix) and the value of cosine(x).