This section will go through general angle basics, introduce trigonometric functions, and the Unit Circle.
The textbook link for Section 5.1 Angles is here: https://openstax.org/books/precalculus-2e/pages/5-1-angles
The textbook link for Section 5.2 Unit Circle: Sine and Cosine Functions is here: https://openstax.org/books/precalculus-2e/pages/5-2-unit-circle-sine-and-cosine-functions
The textbook link for Section 5.3 The Other Trigonometric Functions is here: https://openstax.org/books/precalculus-2e/pages/5-3-the-other-trigonometric-functions
The textbook link for Section 5.4 Right Triangle Trigonometry is here: https://openstax.org/books/precalculus-2e/pages/5-4-right-triangle-trigonometry
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Angle Basics
Angles as Rotations and Radian Measure
Arc Length and Area of Sector
Linear and Angular Speed
Right Angle Trigonometry
The Unit Circle (sine, cosine, tangent)