$f\left(x\right)=2\:lnx\:^3$
$-20-\left(-22\right)-28-\left(-30\right)$
$x^2+12x+49$
$\lim_{x\to-\infty}\left(4x-\sqrt{16x^2+17x+1}\right)$
$\sin\left(x\right)\left(1+\cos\left(x\right)\right)$
$\frac{5}{\sqrt{2}}.\frac{\sqrt{9}}{x+8}$
$31-\left[-56\right]$
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