$\left(-x+\frac{2}{x}\right)^2$
$\int\:\:2\:tan^3x\:dx$
$16+40x^2$
$3ab+2ab+6ab$
$\lim_{x\to0}\left(\frac{x^2-81}{\sqrt{x-3}}\right)$
$\left(x+5\right)\left(x+3\right)+\left(x+3\right)\left(x+4\right)-2x^2$
$x^2-7+x^5-4x+2x^2-8x^3$
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