$\lim\:_{x\to\infty\:\:}\left(\frac{4x^2-1}{1-x^2}\right)^{-x}$
$x^2+11+28$
$m^2-8-48$
$3a+7-11-9a$
$567.2-86.58$
$\left|-2+1\right|-\left|5-7\right|-3\cdot\left(-1\right)+4\cdot\left|-4+1\cdot\left(3\right)\right|\left|-\left(2-3\right)\right|$
$\frac{d}{dx}-x^2-2xy+2y^2$
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