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    1st, 2nd and 3rd derivatives of seven parameter double sigmoid function

    I want the 1st, 2nd and 3rd derivatives of the following seven parameter double sigmoid function Y = a + b /(1 + exp(-c(X-d))) – e/(1 + exp(-f(X-g))) a,b,c,d,e,f,g are the equation parameters. I can go as far as the 1st derivative: If z = (1 + exp(-c(X-d))) and h = (1 + exp(-f(X-g)))...