Finding the derivative of function f (x) = (x ^ 2-5x + 6) / (x ^ 2 + 1)~

f（x）
=1+(-5x+5)/(x^2+1)
∴f'（x）=0+[-5(x^2+1)-2x(-5x+5)]/(x^2+1)^2
=5(x^2-2x-1)/(x^2+1)^2

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