(a) lim x -1(-x^2-2 x+3)
(b) lim x 2 raiz7
© lim x 3 3 x-9x-3
(d) lim x 2^- x^2-2 xx^2-4 x+4
(e) lim x 9 x raizxx^2-1
(f) lim x 2^- x^2-2 xx^2-4 x+4.

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