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(90/x+5)'The calculation above is a derivative of the function f (x)
(90/x)'+(5)'
((90)'*x-(90*(x)'))/(x^2)+(5)'
(0*x-(90*(x)'))/(x^2)+(5)'
(0*x-(90*1))/(x^2)+(5)'
0-90/(x^2)
-90/(x^2)
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