Cosine Function Sign Video
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Definition
The cosine of an angle theta in a right triangle is the ratio of the lenths of the side of triangle adjacent to the angle and the hypotenuse that cosne equals adjacent over hypotenuse. The cosine function is also periodic with period 2 * pi.
Source: mathworld.wolfram.com
Example
cos(theta) = adjacent/hypotenuse. Graph example: http://www.analyzemath.com/trigonometry/graph_cosine.gif
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> Cosine Function
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