$\lim_{x\to\infty}\left(\frac{6z^3+10z+5}{z^3+2z+1}\right)$
$4x^7-6x^6-4x^3+6x^2$
$x^2y'+2xy=x^4y^2+1$
$-68\:-7\:4$
$9x^2-4>0$
$2x^4-2x^3+6x^2$
$y^2-43y+306$
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