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Derivate (x2+1)/(x+1) by using formula d/dx (u/v)=v du/dx - u dv/dx /v2

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\frac{d}{dx}(\frac{x^2+1}{x+1})=\frac{(x+1)2x-(x^2+1)1}{(x+1)^2}\\ = \frac{x^2+2x-1}{(x+1)^2}\\

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Ravindra Pindel

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