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Angles, identities, and trig functions giving you trouble? Trigonometry is explained step-by-step so solving problems feels more approachable.

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Patrick Ford

Callie Rethman

Nick Kaneko

0. Review of College Algebra

1. Measuring Angles

2. Trigonometric Functions on Right Triangles

3. Unit Circle

4. Graphing Trigonometric Functions

5. Inverse Trigonometric Functions and Basic Trigonometric Equations

6. Trigonometric Identities and More Equations

7. Non-Right Triangles

8. Vectors

9. Polar Equations

10. Parametric Equations

11. Graphing Complex Numbers

Default TOC

Trigonometric Functions on Right Triangles

Special Right Triangles

Cofunctions of Complementary Angles

Solving Right Triangles

Defining the Unit Circle

Trigonometric Functions on the Unit Circle

Common Values of Sine, Cosine, & Tangent

Reference Angles

Reciprocal Trigonometric Functions on the Unit Circle

Graphs of the Sine and Cosine Functions

Phase Shifts

Graphs of Secant and Cosecant Functions

Graphs of Tangent and Cotangent Functions

Inverse Sine, Cosine, & Tangent

Evaluate Composite Trig Functions

Linear Trigonometric Equations

Trigonometry Midterm - Part 2 of 2

Determine the value of the given trigonometric circular function with the help of a calculator. Round the answer to four decimal places.cos (-0.7645)

Determine the value of the given trigonometric circular function with the help of a calculator. Round the answer to four decimal places.
cos (-0.7645)