Whitehall District Schools ► Pre-Calculus ► Pre-Calc ► Trig Unit 3: Analytic Trig and Applications ► 5.6 Half-Angle Identities

• 5.6 Half-Angle Identities 2 
  • Find the exact value by using a half-angle identity.cos 22.5°
  • Use an identity to write the expression as a single trigonometric function ...