Homework Help: TRIG

Posted by rio on Friday, November 26, 2010 at 4:37pm.

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

TRIG - Damon, Friday, November 26, 2010 at 4:45pm
2 x = pi +/- pi/3 radians
you take it from there

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