$21ab:50ab_{i}-60ab,84ab$
$\frac{x^3}{16+x^2}$
$\lim_{x\to\infty}\left(\frac{e^x}{2x^3}\right)$
$x^2+3x+3$
$\int x\cdot\left(4-x\right)^{-2}dx$
$\cos-x^2$
$5\:\left(0-3\right)\:$
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