$\int\:\frac{1}{x^4-x^2}dx$
$-7+9z+11n-2z-5n+6$
$log\sqrt{x^3y^{-4}}$
$\lim_{x\to-2}\left(-x^3+x\right)$
$2+\left[-5+-3-2-\left(-1\right)\right]$
$sin\left(2x\right)+2sin\left(\frac{x}{2}\right)cos\left(\frac{x}{2}\right)$
$2x+8-x^2$
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