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Plot[{Sqrt[ x^2 + x^4 ] - Sqrt[ (x + 1)^2 + (x^2 - 1)^2 ]/2 - Sqrt[ (x - 1)^2 + (x^2 - 1)^2 ]/2, Sqrt[ x^2 + x^4 ] - Sqrt[ (x + 1)^2 + (x^2 + 1)^2 ]/2 - Sqrt[ (x - 1)^2 + (x^2 + 1)^2 ]/2}, {x, -5, 5}]
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