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(1/(x/20))'The calculation above is a derivative of the function f (x)
((1)'*(x/20)-(1*(x/20)'))/((x/20)^2)
(0*(x/20)-(1*(x/20)'))/((x/20)^2)
(0*(x/20)-(1*(((x)'*20-(x*(20)'))/(20^2))))/((x/20)^2)
(0*(x/20)-(1*((1*20-(x*(20)'))/(20^2))))/((x/20)^2)
(0*(x/20)-(1*((1*20-(x*0))/(20^2))))/((x/20)^2)
(0*(x/20)-(1*1/20))/((x/20)^2)
-20*x^-2
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