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((x^2)/400)'The calculation above is a derivative of the function f (x)
((x^2)'*400-(x^2*(400)'))/(400^2)
(2*x^(2-1)*400-(x^2*(400)'))/(400^2)
(2*x*400-(x^2*(400)'))/(400^2)
(2*x*400-(x^2*0))/(400^2)
x/200
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