DifferenceQuotient

DifferenceQuotient[f,{x,h}]  gives the difference quotient (f(x+h)-f(x))/h.

DifferenceQuotient[f,{x,n,h}] gives a multiple difference quotient with step h.

DifferenceQuotient[f,{x1,n1,h1},{x2,n2,h2},…] computes the partial difference quotient with respect to x1,x2,….

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