y=2x/(x+1)
y'=((2x)'*(x+1) - 2x*(x+1)')/(x+1)^2 = (2(x+1)-2x*1)/(x+1)^2= 2/(x+1)^2
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y=2x/(x+1)
y'=((2x)'*(x+1) - 2x*(x+1)')/(x+1)^2 = (2(x+1)-2x*1)/(x+1)^2= 2/(x+1)^2