# Trigonometry! #41

Geometry Level 4

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

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

This problem is part of the set Trigonometry.

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