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surface
Tip: Enter z = f(x,y) for surfaces, or x(t), y(t), z(t) for parametric curves. Use u,v for parametric surfaces.
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Visualize the saddle surface z = x² - y² (hyperbolic paraboloid) in 3D. Free interactive graph with rotation, zoom, and export. Ideal for studying critical points and surface curvature.
Mathematical expression: x^2 - y^2