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

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George Levy

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Common Values of Sine, Cosine, & Tangent

Sine & Cosine of π/4

Find Six Trig Function Values Using Reference Triangles - Mult. of pi/4

Learn how to find the sine of 5 pi over 4 without a calculator

Sine, Cosine, & Tangent of 30°, 45°, & 60°

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

Struggling with Trigonometry?