Calcule os seguintes limites, caso existam:
(a) lim x infty[2^x-3^x]
(b) lim x infty 1-2^x1-3^x
© lim x 0 5^x-1x
(d) lim x infty ln (xx+1)
(e) lim x infty[ln (2 x+1)-ln (x+3)]
(f) lim x 0^+ e^1 / x ln (x)
(g) lim x 0 x-tg xx+tg x.
(h) lim x -infty(x+2x+1)^x.
(i) lim x +infty(x-4x-1)^x+3.
(j) lim x +infty(x^2+1x^2-3)^x^2.
(k) lim x +infty(1+12 x-1)^2 x.
(l) lim x +infty(2+2x)^x.

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