Źródło TeX:

f^{^{\prime }}(3)=\lim\limits_{x\rightarrow 3}\frac{f(x)-f(3)}{x-3} = \lim\limits_{x\rightarrow 3}\frac{(1-x^{2})-(1-3^{2})}{x-3} =\lim\limits_{x\rightarrow 3}\frac{1-x^{2}-1+9}{x-3}=