Can someone help me to answer this question, please and explain it.

This is calculus 1

1) Assume that for all real x values, f", the second derivative of the function f is continuous. Use L'Hopital's rule to show that lim f (x + 2h) -2f(x) + f(x - 2h) h-+0 4h2 = f" (2) . Hint: Use the chain rule to differentiate f