6. Trigonometric Identities and More Equations
Double Angle Identities
2:30 minutes
Problem 19
Textbook Question
Textbook QuestionIn Exercises 15–22, write each expression as the sine, cosine, or tangent of a double angle. Then find the exact value of the expression. 𝝅 2 cos² ------ ﹣ 1 8
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