Trigonometry! #41

Geometry Level 3

Find the intersection of the curves y=cosxy=\cos x and y=sin3xy = \sin 3x for π2xπ2-\frac {\pi}{2}≤x≤\frac {\pi}{2}.

Enter the sum of the x-coordinates of the intersections.

This problem is part of the set Trigonometry.

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