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1/3 ×((x^2-2x+2)/(x^2+x+1))' +(x^2+x+1)/(x^2-2x+2)
(u/v)' = (vu' -v'u)/v^2
=(1/3)×(3x^2-3)/(x^2+x+1)^2 × (x^2 + x +1)/(x-1)^2
resolviendo:
=(x+1)/((x-1)(x^2+x+1))
3)
f' = 3e^(3x)
f'' = 9e^(3x)
f''' = 27e^(3x)
.
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f^n = 3^n × e^(3x)