6. Trigonometric Identities and More Equations
Sum and Difference Identities
3:08 minutesProblem 5d
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. c. Find the exact value of the expression. cos 50° cos 20° + sin 50° sin 20°
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