SOLUTION: Find exact solution of 3cos^-1(5x) = 2pi. What is the solution set?

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Question 890010: Find exact solution of 3cos^-1(5x) = 2pi. What is the solution set?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
3cos^-1(5x) = 2pi
cos^-1(5x) = 2pi/3
5x = cos(2pi/3) = -0.5
x = -0.1