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