$8x^2-y^3=2x^3+4x^2$
$\:\left(m-n\right)^5$
$\lim_{x\to0}\left(\frac{\cos \theta-1}{\theta}\right)$
$\left(2x+3y\right)\left(2x^2-6x-6xy+9y^2\right)$
$\left(x^4+3x^2+9\right)\left(x^2-3\right)$
$4b\:2\:x\:4b\:2\:$
$2cos2x=-1$
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