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Trigonometric function

2:02

The Six Trigonometric Functions, Basic Introduction, Trigonometry

3:49

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.
    • Right-angled triangle definitions 

    • Radians versus degrees 

    • Unit-circle definitions 

    • Algebraic values 

    • In calculus 

    • Basic identities 

    • Inverse functions 

    • Applications 

    • History 

    • Etymology