$2^2+6x+9x$
$\sqrt{2x^4}$
$\lim_{x\to0}\left(\frac{1}{x^4}-\frac{1}{x^6}\right)$
$\sin\left(x\right)\tan\left(x\right)+\sin\left(x\right)=0$
$\left(1-n\right)^2$
$\:-\:80xy\:+\:82xy\:-\:95xy\:+\:135xy\:-\:46xy\:+\:3xy$
$\frac{9x^3-6x^2+3x-3}{3x-6}$
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