Directional Derivatives and the Gradient Vector

Gradient of a Function

The gradient of the function $f(x,y) = −\left((\cos x)^2 + (\cos y)^2\right)$ depicted as a projected vector field on the bottom plane. Directional derivative represents the rate of change of the function along any direction specified by $\mathbf{v}$.

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Directional Derivatives and the Gradient Vector

Gradient of a Function

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