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((18*x^-1)/2)'The calculation above is a derivative of the function f (x)
((18*x^-1)'*2-(18*x^-1*(2)'))/(2^2)
(((18)'*x^-1+18*(x^-1)')*2-(18*x^-1*(2)'))/(2^2)
((0*x^-1+18*(x^-1)')*2-(18*x^-1*(2)'))/(2^2)
((0*x^-1+18*-1*x^(-1-1))*2-(18*x^-1*(2)'))/(2^2)
((0*x^-1+18*(-x^-2))*2-(18*x^-1*(2)'))/(2^2)
(18*(-x^-2)*2-(18*x^-1*(2)'))/(2^2)
(18*(-x^-2)*2-(18*x^-1*0))/(2^2)
9*x^-2
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