$a^2-2ab+2^2$
$\lim_{x\to\infty}\sqrt{y^2+1}-y$
$5x^{4}+20x$
$\left(3a^7b^4+2c^3\right)^2$
$\left(2x+1\right)^2-\left(y-5\right)^2$
$\frac{\sqrt{1}}{\frac{6}{\frac{1}{0}}}$
$\frac{5}{6}\left(3-x\right)-\frac{1}{2}\left(x-4\right)\ge\frac{1}{3}\left(2x-3\right)$
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