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(9*ln(7/x))'The calculation above is a derivative of the function f (x)
(9)'*ln(7/x)+9*(ln(7/x))'
0*ln(7/x)+9*(ln(7/x))'
0*ln(7/x)+9*(1/(7/x))*(7/x)'
0*ln(7/x)+9*(1/(7/x))*(((7)'*x-(7*(x)'))/(x^2))
0*ln(7/x)+9*(1/(7/x))*((0*x-(7*(x)'))/(x^2))
0*ln(7/x)+9*(1/(7/x))*((0*x-(7*1))/(x^2))
0*ln(7/x)+9*(-x^-1)
9*(-x)^-1
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