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(x*(20-x)*(18-x))'The calculation above is a derivative of the function f (x)
(x*(20-x))'*(18-x)+x*(20-x)*(18-x)'
((x)'*(20-x)+x*(20-x)')*(18-x)+x*(20-x)*(18-x)'
(1*(20-x)+x*(20-x)')*(18-x)+x*(20-x)*(18-x)'
(1*(20-x)+x*((-x)'+(20)'))*(18-x)+x*(20-x)*(18-x)'
(1*(20-x)+x*((20)'-1))*(18-x)+x*(20-x)*(18-x)'
(1*(20-x)+x*(0-1))*(18-x)+x*(20-x)*(18-x)'
(1*(20-x)+x*(-1))*(18-x)+x*(20-x)*(18-x)'
(20-2*x)*(18-x)+x*(20-x)*(18-x)'
(20-2*x)*(18-x)+x*(20-x)*((-x)'+(18)')
(20-2*x)*(18-x)+x*(20-x)*((18)'-1)
(20-2*x)*(18-x)+x*(20-x)*(0-1)
(20-2*x)*(18-x)+x*(20-x)*(-1)
(20-(2*x))*(18-x)-(x*(20-x))
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