The Six Trigonometric Functions, Basic Introduction, Trigonometry
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Using the period to help evaluate a trig function for an angle - free math help
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The Trigonometric Functions: The Basics! Example 1
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Visualization of trigonometric functions
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Evaluating the six trigonometric functions with undefined values
In mathematics, the trigonometric functions are functions of an angle. They relate the angles of a triangle to the lengths of its sides. Trigonometric functions are important in the study of triangles and modeling periodic phenomena, among many other applications.