$21a^5b^3-14a^8b^7+49a^4b^9$
$\lim_{x\to\infty}\left(\frac{x^2-\sqrt{x^4-4x+1}}{1}\right)$
$x^5^9-x^6^0$
$\int\left(\frac{1}{t-20}\right)dx$
$-3ax\:+\:8x$
$\frac{\sqrt{3x}-\sqrt{2}}{\sqrt{3x}+\sqrt{2}}$
$2-5+4-3-1+19$
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