Posted by Maddie on .
If tan y = 4/3 and y is in Q I'VE find cos 2y

trig 
Jennifer,
Should this be Q IV (quadrant 4)
tan1(4/3) = 53.13 degrees (53.13 degrees = 360 + 53.13 = 306.87, is in quadrant 4)
Evaluate with your calculator cos(2*306.87)