6. Trigonometric Identities and More Equations
Sum and Difference Identities
2:17 minutesProblem 3
Textbook Question
Textbook QuestionBe sure that you've familiarized yourself with the first set of formulas presented in this section by working C1–C4 in the Concept and Vocabulary Check. In Exercises 1–8, use the appropriate formula to express each product as a sum or difference. cos 7x cos 3x
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