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(8/(4-x))'The calculation above is a derivative of the function f (x)
((8)'*(4-x)-(8*(4-x)'))/((4-x)^2)
(0*(4-x)-(8*(4-x)'))/((4-x)^2)
(0*(4-x)-(8*((-x)'+(4)')))/((4-x)^2)
(0*(4-x)-(8*((4)'-1)))/((4-x)^2)
(0*(4-x)-(8*(0-1)))/((4-x)^2)
(0*(4-x)-(8*(-1)))/((4-x)^2)
8/((4-x)^2)
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