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(4-(6/x))'The calculation above is a derivative of the function f (x)
(-(6/x))'+(4)'
((6)'*x-(6*(x)'))/(x^2)+(4)'
(0*x-(6*(x)'))/(x^2)+(4)'
(0*x-(6*1))/(x^2)+(4)'
6*x^-2+0
6*x^-2
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