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 cos(α+β) ?
+188 The same question got answered here as well:
https://web2.0calc.com/questions/angle-lies-in-quadrant-ii-and-tan-12-5-angle-lies
