$\lim\:_{x\to\infty}\left(\frac{3+81^{\frac{221}{x}}}{4}\right)^x$
$4+\frac{2}{u}-\frac{3u}{u+5}$
$\lim_{x\to\frac{x}{2}}\left(\frac{sinx-cosx-1}{cosx}\right)$
$\frac{19.6}{2}$
$\frac{\left(3x^2-7x^2+6x+8\right)}{x-1}$
$\left(3y+6\right)^3$
$m-5-5m+4$
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