$a^4-5a^2+25$
$\sin\left(0.0099\right)$
$x+10=-45$
$\lim_{x\to0}\left(\frac{x^2-x-2}{x^2-3x+2}\right)$
$\frac{25m^2-4}{5m-2}$
$\left(2+x^2\right)\left(4+x^6\right)$
$\lim_{x\to-\infty}\left(9x^4-9x^2\right)$
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