6. Trigonometric Identities and More Equations
Sum and Difference Identities
8:06 minutesProblem 61c
Textbook Question
Textbook QuestionIn Exercises 57–64, find the exact value of the following under the given conditions: a. cos (α + β) 8 1 cos α = ------ , α lies in quadrant IV, and sin β = ﹣------- , β lies in quadrant III. 17 2
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