



 
Robert, √3/2 should make you think of the 12√3 triangle. For what angle x is cos(x) = √3/2. Sketch a graph of y = cos(x) for 0 ≤ x ≤ 2π. Put the xvalue you found above on the sketch. What part of the graph lies above the line y = √3/2? Harley  


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