Find The Derivative Of E2x By The First Principle. I Want To Know To Things The First One Is, Why Is The Number 2 In Red Coming

Find the derivative of e2x by the first principle.
I want to know to things
The first one is, why is the number 2 in red coming up there? It doesn't make sense to me.
The second is, for the right side of the function (eh-1)/2h is the limit going to be 0 or 1, and why?

Please see the picture below where I got confused.

Thanks

Find The Derivative Of E2x By The First Principle. I Want To Know To Things The First One Is, Why Is The Number 2 In Red Coming

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