1. Double Angle Formulas
I. Double Angle Formulas. A) B) C)

2. Double Angle Formulas II. Solving Trig Equations.
A) Move all the terms to one side of the equation
(make the other side = 0). Use the double
angle formulas to rewrite double angle problems.
B) Factor using GCF, Reverse FOIL, Difference of
Squares, or any other factoring method.
C) Set each factor equal to 0 and solve for x.
D) Use a Unit Circle to find values of x that work.
1) There are multiple places where x is that
value. Find them all.