f(x)= (x^4 - x^2)/ (x^4 + x^3 - 2x^2) f '(x) = (x^6- 2x^5 +x^4) / [(x^4 - x^3 - 2x^2)^2] f "(x) = (-2x^13 + 32x^12 - 52x^11 - 64x^10 + 54x^9 + 36x^8/ [(x^4 - x^3 - 2x^2)^4]
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