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((10*x-3)/(x+12))'The calculation above is a derivative of the function f (x)
((10*x-3)'*(x+12)-((10*x-3)*(x+12)'))/((x+12)^2)
(((10*x)'+(-3)')*(x+12)-((10*x-3)*(x+12)'))/((x+12)^2)
((10*(x)'+(10)'*x+(-3)')*(x+12)-((10*x-3)*(x+12)'))/((x+12)^2)
((10*(x)'+0*x+(-3)')*(x+12)-((10*x-3)*(x+12)'))/((x+12)^2)
((0*x+10*1+(-3)')*(x+12)-((10*x-3)*(x+12)'))/((x+12)^2)
((0+10)*(x+12)-((10*x-3)*(x+12)'))/((x+12)^2)
(10*(x+12)-((10*x-3)*(x+12)'))/((x+12)^2)
(10*(x+12)-((10*x-3)*((x)'+(12)')))/((x+12)^2)
(10*(x+12)-((10*x-3)*((12)'+1)))/((x+12)^2)
(10*(x+12)-((10*x-3)*(0+1)))/((x+12)^2)
(10*(x+12)-((10*x-3)*1))/((x+12)^2)
(10*(x+12)-(10*x)+3)/((x+12)^2)
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