This is a lesson to show students how half-angle and double-angle formulas are used to find exact values of non-special angles, and simplify expressions. The first slide asks students to use their knowledge of the sum formula to find the double-angle formula for sin, cos and tan.

To review, try: Double & Half Angle Formulas Scavenger Hunt

For more fun ways to review important topics, try these:
Scavenger Hunts
Fun PowerPoint Review Games
Relays
Tic Tac Toes
Partner Problems
Bingos

California Common Core Standard
Prove and apply trigonometric identities.
F-TF 10. Prove the half angle and double angle identities for sine and cosine and use them to solve problems. (CA)

Previous CA Standard for Trigonometry
11.0 Students demonstrate an understanding of half-angle and double-angle formulas for sines and cosines and can use those formulas to prove and/or simplify other trigonometric identities.

NOTE: Math Type 5.0 was used to create these slides.