Pre-Calc/Trig Unit 3: Analytic Trig and Applications/5.5 Double Angle Identities Use an identity to write the expression as a single trigonometric function ... Use an identity to write the expression as a single trigonometric function or as a single number.

2 cos² 22.5° - 1

]]> 1.0000000 0.3333333 0 true true abc

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