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In Exercises 57–64, find the exact value of the following under the given conditions:c. tan (α + β)8 1cos α = ------ , α lies in quadrant IV, and sin β = ﹣------- , β lies in quadrant III.17 2
6. Trigonometric Identities and More Equations
Sum and Difference Identities
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2:14 minutesOpen Question
In Exercises 69–74, rewrite each expression as a simplified expression containing one term.sin (α - β) cos β + cos (α - β) sin β
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