$\left(2pq^3-5p^4q^2\right)^2$
$r^2+4r-3$
$6x^3+8y^2+4x$
$-4m^7x+12m^5xn^2-28m^3xn^4$
$\lim_{x\to\infty}\left(x-\sqrt{x^2+4}\right)$
$5\sqrt{25}$
$7x^2+4\sqrt{x}^2$
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