curve with two minimum points

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how can we mathematically express a function whose the graph is a curve, like a parabola, where it has a minimum point (or maximum if opposite, it doesn't matter) BUT the minimum point is not one, but TWO points, one next to the other? is it possible?

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How about $x^4-4x^2$? This has minima at $x=\sqrt{2}$ and $x=-\sqrt{2}$.