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(8*ln(1/x))'The calculation above is a derivative of the function f (x)
(8)'*ln(1/x)+8*(ln(1/x))'
0*ln(1/x)+8*(ln(1/x))'
0*ln(1/x)+8*(1/(1/x))*(1/x)'
0*ln(1/x)+8*(1/(1/x))*(((1)'*x-(1*(x)'))/(x^2))
0*ln(1/x)+8*(1/(1/x))*((0*x-(1*(x)'))/(x^2))
0*ln(1/x)+8*(1/(1/x))*((0*x-(1*1))/(x^2))
0*ln(1/x)+8*(-x^-1)
8*(-x)^-1
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