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(7/(x*ln(x)))'The calculation above is a derivative of the function f (x)
((7)'*x*ln(x)-(7*(x*ln(x))'))/((x*ln(x))^2)
(0*x*ln(x)-(7*(x*ln(x))'))/((x*ln(x))^2)
(0*x*ln(x)-(7*((x)'*ln(x)+x*(ln(x))')))/((x*ln(x))^2)
(0*x*ln(x)-(7*(1*ln(x)+x*(ln(x))')))/((x*ln(x))^2)
(0*x*ln(x)-(7*(1*ln(x)+x*(1/x))))/((x*ln(x))^2)
(0*x*ln(x)-(7*(ln(x)+1)))/((x*ln(x))^2)
(-7*(ln(x)+1))/(x^2*(ln(x))^2)
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