$\left(2\right)^2-2$
$-3\:+\frac{4}{x-1}+\frac{-3x^2}{5-4x-x^2}$
$x^2-6y^2-7xy+40y^2+9y^2-16$
$-5\cdot\left(-38+2\cdot\left(-24+47\right)\right)+25$
$5x-3x^2+1$
$\lim_{n\to\infty}\:\left(\frac{ln\left(n\right)}{n^{\frac{1}{n}}}\right)$
$3x\left(5a-2b\right)+2y\left(5a-2b\right)$
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