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I understand that, but what I'm looking for is a solution using first principles (i.e. from lim h->0 ((f(x+h) - f(x))/h) where in this case f(x) is ax) Thanks anyway :)

Hi I'm new to this place so I guess I should say I'm from NZ and in first year of university. I'm not actually doing maths this year, but I did university-level maths during my last year of high school (so just assume I have the knowledge of a university first-year student), and maths is still...