A series of free Calculus Video Lessons.
Directional derivative, and the corresponding definition of the gradient vector.
The Gradient Vector - Notation and Definition
This video talks about the directional derivative, and the corresponding definition of the gradient vector.
Gradient and directional derivatives
Introduction to the directional derivatives and the gradient
Finding the Directional Derivative
This video gives the formula and do an example of finding the directional derivative that corresponds to a given angle.
Multivariable Calculus: Directional derivative of $f(x,y)$
This video presents an example and calculates the derivative of a function of two variables in a particular direction. The derivative of $f(x,y) := 1 - x^2/2 - y^4/4$ in the direction of the vector ${\bf u} := (1,1)$.
Try out our new and fun Fraction Concoction Game.
Add and subtract fractions to make exciting fraction concoctions following a recipe. There are four levels of difficulty: Easy, medium, hard and insane. Practice the basics of fraction addition and subtraction or challenge yourself with the insane level.
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