$\left(\frac{4}{5}-2x\right)^2$
$2p^5+6q^42p^5-6q^4$
$-5m+2mn-4n^2+6m-7mn-m+n^2$
$-55-\left(-45\right)$
$\left(-5a^2b\right)\left(3a^4b^2\right)$
$\lim_{x\to\infty}\left(\frac{\sqrt{5+6x^2}}{18-15x}\right)$
$\lim_{x,y\to0,0}\left(\frac{x^{\:2}-y^2}{x^{\:2}+y^2}\right)$
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