$\left[-4\left(-1\right)\right]:2\left[3:\left(-3\right)\right]$
$\frac{d}{dx}\left(2\cos^2\left(x^2+2\right)\right)$
$\int\frac{\ln\left(2\right)}{z^2}dx$
$\frac{3x^4-3x^3+2kx^2-2x+4}{2x+4}$
$2\:\:-8\:\:16$
$4ab+2a$
$6z+8z^2+z+5z^2$
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