$\lim_{x\to\infty}\left(2^{2-x}\right)$
$29m+12n+3n+15m-6m$
$\sqrt[4]{81x^5y^8}$
$-2\sqrt{20}$
$5x^4-30x^2+45$
$\lim_{x\to-3}\left(x^2-3\right)$
$\left(13x^2-y\right)^2$
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