$\sqrt{a^4}$
$x^2+5x-150$
$1-49a^2b^2$
$\frac{15x^4y^5}{3x^3y^6}$
$\lim_{x\to-2}\left(\sqrt{x^2-2x}\right)$
$\frac{12x^3y}{2x^2}$
$\left(m-1\right)^2$
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