3:53The Definition of the Derivative of a Function from First Principals.J. Wegner75 views·1 year ago
3:05Understanding The Dilation of a Quadratic. It's not what students often think!J. Wegner532 views·2 years ago
1:56Oscar The (sort of) Border Collie Explains That Equations Must be BalancedJ. Wegner152 views·9 years ago