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