**See Also**

cosine video, functions video, law of cosines video, trigonometric functions video.

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This math video tutorial gives a step by step explanation to a math problem on "Law Of Cosines 3".

Law of cosines 3 video involves cosine, functions, law of cosines, trigonometric functions. The video tutorial is recommended for 9th Grade, 10th Grade, and/or 11th Grade Math students studying Algebra, Trigonometry, Pre-Algebra, Pre-Calculus, and/or Advanced Algebra.

The cosine of an angle is the ratio of the length of the adjacent side to the length of the hypotenuse.

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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