Computational design enthusiast.

x = 0..amt*2..#amt;
y = amp*Math.Sin(k*x)-amp;
z = (-1/amt)*Math.Pow(x-amt, 2)+amt;
//
pts = Point.ByCoordinates(x, y, z);
//
n1 = NurbsCurve.ByControlPoints(pts);
n2 = Geometry.Mirror(n1, Plane.XZ());
[n1, n2];