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how create curve with equation x^4/a^4+y^4/b^4=1

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Good day! How I can create curve, which have equation x^4/a^4+y^4/b^4=1 in Femap workplane? Menu->Geometry->Curve->Spline->Equation allows create spline with application parametric equation coefficients. It's not what I need. Can I input equation and get my curve? Who knows?