SOLUTION: given sinθ=4/5 and θ is obtuse, find cosθ and 2tanθ

Algebra ->  Trigonometry-basics -> SOLUTION: given sinθ=4/5 and θ is obtuse, find cosθ and 2tanθ      Log On


   

Question 810109: given sinθ=4/5 and θ is obtuse, find cosθ and 2tanθ
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
given sinθ=4/5 and θ is obtuse, find cosθ and 2tanθ
***
You are working with 3-4-5 reference right triangle in quadrant II where sin>0, cos<0, tan<0
sinθ=4/5
cosθ=-3/5
tanθ=sin/cos=-4/3
2tanθ=-8/3