Wolfram Alpha:
Cross Sections of Quadratic Surfaces: Webpage File
Circle of Curvature: Website File
Curvature and Torsion: Website File
Frenet Frame: Website File
Directional Derivatives: Website File
Constrained Optimization: Website File
Finite Limit at a Finite Point: Website File
Multivariable Epsilon-Delta Limit Definitions: Website File
Directional Derivatives In 3D: Website File
Double Integral for Volume: Website File
Polar Area Sweep: Website File
Grapher:
You may need to open Grapher first, and then use Grapher to open the files.
12_6.gcx
v_v_fnc_1.gcx
v_v_fnc_2.gcx
Limit_DNE.gcx
Squeeze_Theorem.gcx
Partial_Derivatives_Second_Example.gcx
Tangent_Plane.gcx
Tangent Plane to Level Surface.gcx
Saddle_Point.gcx
Max_Min.gcx
Lagrange_Multipliers_No_Max.gcx