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