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Find the intersection of the curves y=cosxy=\cos xy=cosx and y=sin3xy = \sin 3xy=sin3x for −π2≤x≤π2-\frac {\pi}{2}≤x≤\frac {\pi}{2}−2π≤x≤2π.
Enter the sum of the x-coordinates of the intersections.
This problem is part of the set Trigonometry.
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