Chapter 3 – Trig Formulas and Inverse Functions

Topic 3.5
Angle Sum Formulas

Angle Sum Formulas covers the calculation aspects of working with the angle sum formulas. It is assumed the students already know each formula, as no attempt to derive them is made here. They are most commonly proved by geometric means, but we prefer a more algebraic approach which can be found in the corresponding in-class activity.

Transcript
Slideshow: Full – 4 per page – 9 per page

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Trigonometry by Mike Weimerskirch and the University of Minnesota Board of Regents is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License, except where otherwise noted.