1. Double Angle Identities
Find an expression for sin(2 )
ex. If sin = 2 find sin(2 ) if is in quad 1

2. If sin = - 2 over ( , ) find cos(2 )
Find an expression for cos(2 )

3. Show that cos( - ) = sin
Show sin( + ) + cos( + ) = cos

4. sin( + ) - sin( - ) = 2cos sin