$\left(a^2x+by\right)^2$
$-\frac{4}{4}$
$3\sqrt{x}+38=41$
$\lim_{x\to-2i}\left(\frac{2x-\left(x+2i\right)^2}{\left(x^2+4\right)^2}\right)$
$-u^2+8u-4$
$\frac{x^2+1}{\left(x+1\right)\left(x-2\right)\left(x-3\right)}$
$-50+10x+3x^2=0$
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