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(6*ln(9*x))'The calculation above is a derivative of the function f (x)
(6)'*ln(9*x)+6*(ln(9*x))'
0*ln(9*x)+6*(ln(9*x))'
0*ln(9*x)+6*(1/(9*x))*(9*x)'
0*ln(9*x)+6*(1/(9*x))*((9)'*x+9*(x)')
0*ln(9*x)+6*(1/(9*x))*(0*x+9*(x)')
0*ln(9*x)+6*(1/(9*x))*(0*x+9*1)
0*ln(9*x)+6*x^-1
6*x^-1
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