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Algebra

Section 2

Trigonometric Functions and the Unit Circle

Book Version 13
By Boundless
Boundless Algebra
Algebra
by Boundless
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7 concepts
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Radians

Radians are another way of measuring angles, and the measure of an angle can be converted between degrees and radians.

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Defining Trigonometric Functions on the Unit Circle

Identifying points on a unit circle allows one to apply trigonometric functions to any angle.

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Special Angles

The unit circle and a set of rules can be used to recall the values of trigonometric functions of special angles.

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Sine and Cosine as Functions

The functions sine and cosine can be graphed using values from the unit circle, and certain characteristics can be observed in both graphs.

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Tangent as a Function

Characteristics of the tangent function can be observed in its graph.

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Secant and the Trigonometric Cofunctions

Trigonometric functions have reciprocals that can be calculated using the unit circle.

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Inverse Trigonometric Functions

Each trigonometric function has an inverse function that can be graphed.

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