SOLUTION: if tan&#952; = -3/4 90°<&#952;<180°, find cos&#952;

Algebra ->  Trigonometry-basics -> SOLUTION: if tan&#952; = -3/4 90°<&#952;<180°, find cos&#952;      Log On


   

Question 566972: if tanθ = -3/4 90°<θ<180°, find cosθ
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
if tanθ = -3/4 90°<θ<180°, find cosθ
you are working with a reference angle in quadrant II where tanθ-3/4
hypotenuse of right triangle=√(3^2+4^2)=√(9+16)=√25=5
cosθ=-4/5