$x^4-4\le0$
$x^3-9x^2+27-27$
$x^2\sqrt{x^3}+1$
$1.2x^2,\:3x+-4$
$6x^2+x-35$
$\lim_{t\to\infty}t^{\frac{9}{t}}$
$3x^4x$
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