$arcos\:\frac{x}{2}-\frac{\sqrt{4-x^2}}{x}$
$-x^3-4x-4$
$\lim_{x\to0}\left(\frac{x^5-243}{x-3}\right)$
$-\frac{72}{-4}$
$\frac{5}{2}a^5\:.\:\frac{3}{5}a^5$
$\int x\left(9x^2+3\right)^5dx$
$\frac{-4x^3-2x^2-x+1}{x+2}$
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