$\int\frac{4x^2}{\left(x^2+4\right)^2}dx$
$x^2+6x+28$
$\frac{4x^2-8x+21}{x-2}$
$\int\left(4x^3+3\right)^4\cdot12x^2dx$
$\lim_{x\to\pi}\left(cos\left(ax\right)\right)$
$\frac{x^3\:-\:8}{x-2}$
$\left(12r^6\right)^3$
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