Solve the equation on the interval [0,2π) .
−9cosx=4
Select all correct solutions.
approximately 1.111
approximately 2.031
approximately 4.252
approximately 5.173
-9cos (x) = 4
cos (x) = -4/9
Take the arccos
arccos (-4/9) = x = 2.031 and 2pi - 2.031 = 4.252
+148 
