$\sqrt{x}-x=1-x$
$secx+1=0$
$\frac{8x^5y^2}{x^7y^7}$
$9x^5-15x^3+6x$
$\lim_{x\to-8}\left(\frac{\sqrt[2]{1-x}-3}{2+\sqrt[3]{x}}\right)$
$453-\infty$
$n^{xz}-xz^2+y=0$
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