Encontre o limite ou demonstre que não existe.
(a) lim x -infty 4 x^7-18 x^3+9
(b) lim x infty raiz[3]x+12 x-2 x^2
© lim x infty 12 x+3
(d) lim x -infty 1-x-x^22 x^2-7
(e) lim x infty x^2+3x^2
(f) lim x infty tan(3 x)x^3
(g) lim x 0 sin(7 x)x
(h) lim x infty 1-e^x1+2 e^x
(i) lim x infty 1-e^x1+2 e^x
(j) lim x infty 8+x-4 x^2raiz6+x^2+7 x^4
(k) lim x 0 x^4-1x^3-1
(l) lim x 0 raiz9+x-3x
(m) lim x 0 (-6+x)^2-36x
(n) lim x 2 1x-2
(o) lim x -1 raizxx^2-1
§ lim x -4 -5x+4
(q) lim x -4 -4x^2.

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