$x^2-4x-6=0$
$\frac{d}{dx}2x^{x^2}$
$\lim_{x\to\infty}\left(\frac{\pi+\ln\left(x\right)}{x^2-1}\right)$
$25a^4+20a^2\:b^2$
$\left(\sqrt{5}+1\right)\:\left(\sqrt{5}-1\right)-\left(\sqrt{7}+\sqrt{3}\right)\:\left(\sqrt{7}-\sqrt{3}\right)$
$2^5-2^2$
$-\frac{5}{9}x-\frac{1}{3}x$
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