$2.75x+2.25-1.5x+3$
$\frac{cotx}{tanx}+1$
$hbn\:,mkm4$
$4z^2+4z-4$
$\left(5x^{3\:}y\right)\:\left(-4xy\right)$
$\left(x^2-6\right)\left(x^2+6\right)$
$\left(\frac{2}{3}m^4-1\right)^2$
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