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