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((x-4)/(x-5))'The calculation above is a derivative of the function f (x)
((x-4)'*(x-5)-((x-4)*(x-5)'))/((x-5)^2)
(((x)'+(-4)')*(x-5)-((x-4)*(x-5)'))/((x-5)^2)
(((-4)'+1)*(x-5)-((x-4)*(x-5)'))/((x-5)^2)
((0+1)*(x-5)-((x-4)*(x-5)'))/((x-5)^2)
(1*(x-5)-((x-4)*(x-5)'))/((x-5)^2)
(1*(x-5)-((x-4)*((x)'+(-5)')))/((x-5)^2)
(1*(x-5)-((x-4)*((-5)'+1)))/((x-5)^2)
(1*(x-5)-((x-4)*(0+1)))/((x-5)^2)
(1*(x-5)-((x-4)*1))/((x-5)^2)
-1/((x-5)^2)
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