$x+6\:\sqrt{x^2+12x+36}$
$\frac{2}{5}n+6=10$
$4z^2+3z-6z$
$\int3x^3lnx^2\:dx$
$\lim_{x\to\infty}\left(-x\cdot\:cos\left(x\right)+sin\left(x\right)\right)$
$\left(61+23\right)-\left(15+17\right)$
$\lim_{x\to0}\left(\frac{tanx-x}{xtanx}\right)$
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