+73 Consider the following equation:
\(f'(a)=\lim_{h\rightarrow 0}\frac{f(a+h)-f(a)}{h}\)
Let \(f(x)=\sqrt[3]x\)
If \(a\ne 0\), use the above formula to find \(f'(a) = \)
Show that \(f'(0)\) does not exist and that f has a vertical tangent line at (0,0)
