User:ShaunMacPherson/latex



\begin{align} f'(3)&=\lim_{h \to 0}{(3+h)^2 - 9\over{h}} \\ &=\lim_{h \to 0}{9 + 6h + h^2 - 9\over{h}} \\ &=\lim_{h \to 0}{6h + h^2\over{h}} \\ &=\lim_{h \to 0} (6 + h) \\ &= 6. \end{align} $$



\begin{align} Po=[(1-(1+k)^(-n))/k] + f(1+k)^(-n) \end{align} $$