If you are struggling with a concept of a section in this chapter you can listen to the podcast from the section to help you better understand the concept.
12-1A Trigonometric Functions in Right Triangles
12-1B Trigonometric Ratios of Special Angles
12-2 Angles and Angle Measure
12-3 Trigonometric Functions of General Angles
12-4 Law of Sines
12-5 Law of Cosines
12-9 Inverse Trigonometric Functions