Changes

'''Cosine''' is a [[trigonometry|trigonometric]] function.

'''Cosine''' is a [[trigonometry|trigonometric]] function describing the ratio of the adjacent side to the hypotenuse in a right triangle.

<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]]