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((1*x)/400)'The calculation above is a derivative of the function f (x)
((1*x)'*400-(1*x*(400)'))/(400^2)
(((1)'*x+1*(x)')*400-(1*x*(400)'))/(400^2)
((0*x+1*(x)')*400-(1*x*(400)'))/(400^2)
((0*x+1*1)*400-(1*x*(400)'))/(400^2)
(1*400-(1*x*(400)'))/(400^2)
(1*400-(1*x*0))/(400^2)
1/400
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