6. Trigonometric Identities and More Equations
Sum and Difference Identities
2:42 minutesProblem 7b
Textbook Question
Textbook QuestionIn Exercises 5–8, each expression is the right side of the formula for cos (α - β) with particular values for α and β. b. Write the expression as the cosine of an angle. 5π π 5π π cos ------- cos -------- + sin -------- sin ------- 12 12 12 12
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