where f'(x) = gradient (or slope) of f(x) at x = x.

Prove that:
d/dx(x^2) = 2x

without using calculus.

Oh, you did that on purpose? I thought it was accidental, since this problem doesn't look like it's very easy.

I mean I realise that it may be easy given a cerain knoweledge of some advanced math (or whatever), but the difficulry rating is also designed to indicate how many people would be able to solve this problem, and I'm venturing to guess that it's above the level of a casual visitor.

Posted by levik on 2002-07-31 03:49:36