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((x*(200-x))/2)'The calculation above is a derivative of the function f (x)
((x*(200-x))'*2-(x*(200-x)*(2)'))/(2^2)
(((x)'*(200-x)+x*(200-x)')*2-(x*(200-x)*(2)'))/(2^2)
((1*(200-x)+x*(200-x)')*2-(x*(200-x)*(2)'))/(2^2)
((1*(200-x)+x*((-x)'+(200)'))*2-(x*(200-x)*(2)'))/(2^2)
((1*(200-x)+x*((200)'-1))*2-(x*(200-x)*(2)'))/(2^2)
((1*(200-x)+x*(0-1))*2-(x*(200-x)*(2)'))/(2^2)
((1*(200-x)+x*(-1))*2-(x*(200-x)*(2)'))/(2^2)
((200-2*x)*2-(x*(200-x)*(2)'))/(2^2)
((200-2*x)*2-(x*(200-x)*0))/(2^2)
(200-(2*x))/2
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