$-\:21a^4\:-\:2a^4$
$2ab^2\:2a^2b$
$mn^2\left(n^2+2m-5m^2\right)$
$-\frac{35v}{f^2}+\frac{100v^2}{f^4}+\frac{49}{16}$
$\lim_{x\to-\infty}\left(\frac{3x+4}{\sqrt[2]{2x^2-5}}\right)$
$x^2+1\ge0$
$x ^ { \frac { x } { x } }$
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