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