The angle θ lies in Quadrant IV . sinθ=−2/3 What is cosθ?
Accepted Solution
A:
Consider this option: 1) if the angle belongs to IV quadrant, it means cos is in [0;1]; 2) [tex]cos \alpha= \sqrt{1-sin^2 \alpha} [/tex] using this formula cosθ=√(5/9) ⇒ cosθ=√5/3