Розв'язати нерівності:
1) x^3-3x^2+x+1≥0;
2) (9x^2-12x+4)^5 (4-3x-x^2)/(x^2+2x-8)(x+3)^11≥0;
3) (x^4-2x^2-8)/(x^2+2x+1)^3;
4) x^2+x+12>0.
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