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GeoGebra Bezier-Splines implementing und using

↑ added an additional point

Do it yourself instructions

Do it yourself instructions
c_1(t)=Curve(A1 (-t + 1)³ + A12 * 3t (-t + 1)² + A21 * 3t² (-t + 1) + A2 t³, t, 0, 1) Surface(c_1, 2π, yAxis) s_1

Bezier-Splines implementing und using (video do it yourself script version)