$\lim_{x\to6}\left(\frac{1}{2}x-4\right)$
$\frac{5x^4+40x^2+75}{x\left(x^2+5\right)^2}$
$\int\frac{1}{x^3\left(x^2+4\right)}dx$
$2ax^2-4ax+2a$
$\int cos^54z\:dx$
$\frac{5x^3-2x+6}{x-4}$
$107.6\cdot120$
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