Image: Unit Circle Definitions of Six Trigonometric Functions

Description: All of the six trigonometric functions of an arbitrary angle θ can be defined geometrically in terms of a unit circle centred at the origin of a Cartesian coordinate plane. The values of sin ⁡ ( θ ) {\displaystyle \sin(\theta )} , tan ⁡ ( θ ) {\displaystyle \tan(\theta )} , and csc ⁡ ( θ ) {\displaystyle \csc(\theta )} are represented by the ordinates of points A, B, and D, respectively, while the values of cos ⁡ ( θ ) {\displaystyle \cos(\theta )} , cot ⁡ ( θ ) {\displaystyle \cot(\theta )} , and s e c ( θ ) {\displaystyle sec(\theta )} are represented by the abscissas of points A, C and E, respectively.
Title: Unit Circle Definitions of Six Trigonometric Functions
Credit: Own work based on: Unit Circle Definitions of Six Trigonometric Functions.png by Onmaditque
Author: Vectorization: Alhadis
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