- #1

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**directional derivative**. Ok, I know the math behind this as well as the way to compute the directional derivative through the dot product of the gradient and the unit vector:

Duf(x,y)=∇f(x,y)⋅u

Where:- Duf(x,y) represents the
**directional derivative** - ∇f(x,y) represents the
**gradient**

- u represents the
**unit vector**

**what's exactly a directional derivative? what's a gradient? for what are they used?**

Thanks.