**See Also**

cotangent video, functions video, trigonometric functions video.

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This math video tutorial gives a step by step explanation to a math problem on "Cotangent 90".

Cotangent 90 video involves cotangent, functions, trigonometric functions. The video tutorial is recommended for 9th Grade, 10th Grade, and/or 11th Grade Math students studying Algebra, Trigonometry, Pre-Calculus, and/or Advanced Algebra.

The cotangent is the multiplicative inverse of tangent: the ratio of the length of the adjacent side to the length of the opposite side.

In mathematics, the trigonometric functions are functions of an angle. They are important in the study of triangles and modeling periodic phenomena, among many other applications. Trigonometric functions are commonly defined as ratios of two sides of a right triangle containing the angle, and can equivalently be defined as the lengths of various line segments from a unit circle.

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