$\frac{\left(2x+1\right)}{x+2}<1$
$\int\frac{\sqrt{x^2-16\:}}{x^4}dx$
$\left(3a^2-\frac{2}{5}b^3\right)^2$
$\left(a-6\right)\left(a-7\right)$
$\lim_{x\to1}\left(\frac{x^2+3\cdot x-4}{x-1}\right)$
$5x^4-20x^3+15x^2$
$y'=21+18x+21y+18xy$
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