## cosine
α, is the ratio of the side adjacent
to the angle α to the hypotenuse
in a right-angled triangle. It is a trigonometric
function.
If the x-axis is extended, the graph of y = cos x
repeats itself every 360°, i.e. the period of the cosine function is 360°.
See also cosine rule. ## Related category• FUNCTIONS | |||||||

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