Trig: Sum, Difference &Double Angle Identities 355

This lesson is part of the series: Trigonometry

This 73 minute trigonometry lesson focuses on the four sum and difference identities: sin (A + B ), sin (A – B), cos (A + B), and cos (A - B). We'll also look at the double angle identities: sin (2A) and cos (2A).

This lesson show you how to find:
- exact value of angles using the sum and difference identities and special angles
- write the sum and difference identities as single trig expressions
- simplify expressions using the sum and difference identities
- find the formulas for the double angle identities using the sum & difference identities

This lesson contains explanations of the concepts and 20 example questions with step by step solutions plus 5 interactive review questions with solutions.

Lessons that will help you with the fundamentals of this lesson include:
- 315 Basic Trigonometry Part II (http://www.mindbites.com/lesson/5123)
- 320 Trigonometry on the coordinate Plane (http://www.mindbites.com/lesson/5122)
- 350 Simplifying Trig Expressions & Proving Trig Identities (http://www.mindbites.com/lesson/5119)

All lessons have been prepared by a certified teacher, B.A., B. Ed. (Math Major) with 30+ years experience teaching Math to High School Students and Continuing Education learners. She has a reputation for teaching the math class that “you want to be in.” For more information please visit Math Made Simple: http://www.mathmadesimple.com/

Through her teaching and tutoring experiences, the growth of technology and the internet she recognized a need to make comprehensive math lessons available via the Internet to help:

- High school students who have missed a class or maybe just need a little extra help or are in sports or other extra curricula activities
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