Differu: Gwahaniaeth rhwng fersiynau

<math> f'(x) = \frac{dy}{dx}=\lim_{\Delta x\rightarrow 0 }\frac{(x+\Delta x)^2-x^2}{\Delta x}=\lim_{\Delta x\rightarrow 0}\frac{x^2+2x\Delta x + (\Delta x)^2-x^2 }{\Delta x}=\lim_{\Delta x\rightarrow 0}\frac{(2x +\Delta x)\Delta x}{\Delta x}=\lim_{\Delta x\rightarrow 0}2x+\Delta x=2x</math>