- #1

Monarch

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## Homework Statement

What is Lim

_{Δx→0}[itex]\frac{y(x+Δx) - y(x)}{Δx}[/itex] ?

## The Attempt at a Solution

I know that this is just differentiation from first principles, you can take that and derive the whole d/dx relation and stuff, but what exactly

*is*this?