## At A Glance

### Trigonometry: Sum, Difference & Double Angle Identities

http://www.mindbites.com/lesson/5126-trig-sum-difference-double-angle-identities-355 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)
Length: 04:41

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