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Question: how do i write a procedure in maple to compute f'''

Question:how do i write a procedure in maple to compute f'''

superbike1 10
numerical-analysis
March 13 2017
1

I want to write a procedure ThirdDer := proc(f,x0,h) which, given the funcion f, the point x0 and the step size h returns the value of f'''(x0). where f'''(x0) = (f(x0 +2h)−2f(x0 +h)+2f(x0 −h)−f(x0 −2h))/2h^3 

help

I tried splitting f''' up and assigning the 4 different parts as a letter then putting it all together but that didnt work..
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