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Angle  α lies in quadrant II , and tanα=−12/5 . Angle  β lies in quadrant IV , and cosβ=3/5 .

What is the exact value of sin(α+β) ?

sin(α+β) = 

 Apr 2, 2020
 #1
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sin(α+β) = 17/65.

 Apr 2, 2020

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