# What's the formula to compute the divided difference approximation for the third order greeks?

I can't seem to find the quotient required to approximate the third order greeks
Speed, Zomma, Color and Ultima

$$f^3(x)=\frac{1}{h^3}\left(f(x+2h)-3f(x+h)+3f(x)-f(x-h) \right)$$
$$f^3(x)=\frac{1}{2h^3}\left(f(x+2h)-2f(x+h)+2f(x-h)-f(x-2h) \right)$$