Double and Half Angle Formulas covers examples similar to Combining Trig and Inverse Trig Functions, Parts I-II. Students should be able to derive the formulas on their own, or otherwise be presented with the formulas. The emphasis is on calculating numerical answers, and on the selection of the appropriate formula and finding the necessary values to input. Details of the simplification are not dealt with in the video. Students will need practice, or otherwise be adept at handling the simplification of complicated fractional expressions with radicals.
Precalculus Copyright © 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.