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Cos






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Elementary Functions > Cos[z] > Introduction to the trigonometric functions





Applications of trigonometric functions


The prime application of the trigonometric functions are triangle theorems. In a triangle, ,, and represent the lengths of the sides opposite to the angles, Δ the area , the circumradius, and the inradius. Then the following identities hold:

For a right‐angle triangle the following relations hold:

Because the trigonometric functions appear virtually everywhere in quantitative sciences, it is impossible to list their numerous applications in teaching, science, engineering, and art.