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(ln(x-(9.1*x^-1)))'The calculation above is a derivative of the function f (x)
(1/(x-(9.1*x^-1)))*(x-(9.1*x^-1))'
(1/(x-(9.1*x^-1)))*((x)'+(-(9.1*x^-1))')
(1/(x-(9.1*x^-1)))*((-(9.1*x^-1))'+1)
(1/(x-(9.1*x^-1)))*(9.1*(x^-1)'+(9.1)'*x^-1+1)
(1/(x-(9.1*x^-1)))*(9.1*(x^-1)'+0*x^-1+1)
(1/(x-(9.1*x^-1)))*(9.1*-1*x^(-1-1)+0*x^-1+1)
(1/(x-(9.1*x^-1)))*(9.1*(-x^-2)+0*x^-1+1)
(1-(9.1*x^-2))/(x-(9.1*x^-1))
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