SOLUTION: if cos theta = 4/5 and theta lies in quadrant IV, find sin(theta-pi)

Algebra ->  Trigonometry-basics -> SOLUTION: if cos theta = 4/5 and theta lies in quadrant IV, find sin(theta-pi)       Log On


   

Question 968324: if cos theta = 4/5 and theta lies in quadrant IV, find sin(theta-pi)
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
if cos theta = 4/5 and theta lies in quadrant IV, find sin(theta-pi)
cosx=4/5(Q4)
sinx=-3/5
sin(x-π)=sinxcosπ-cosxsinπ=-3/5*-1-4/5*0=3/5