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Line 1: − <math>\cos \theta = \sin \left(\frac{\pi}{2} - \theta \right) = \frac{1}{\sec \theta}\,</math> − − − ==Cosine Graph== Line 31:
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move down equation - it does not really define a 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''.
'''Cosine''' is a [[trigonometric function]] describing the [[ratio]] of the adjacent side to the [[hypotenuse]] in a [[right triangle]]. It is often abbreviated ''cos''.
The basic cosine graph is as follow:
The basic cosine graph is as follow:
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That would be a full period of the graph - as 2π [[radians]] is equivalent to one circle. The graph continues in that pattern.
That would be a full period of the graph - as 2π [[radians]] is equivalent to one circle. The graph continues in that pattern.
==Relation to secant==
<math>\cos \theta = \sin \left(\frac{\pi}{2} - \theta \right) = \frac{1}{\sec \theta}\,</math>
[[Category:Trigonometry]]
[[Category:Trigonometry]]