posted by rio .
Sketch the graphs of y=cos 2x and y= -0.5 over the domain -pi<x<pi. use an algebraic method to determine the values of x where these two graphs intersect. use exact value.
Please help me work this problem out! I sketched the graph, just not sure how to set up the equation. Thankyou
2 x = pi +/- pi/3 radians
you take it from there