$9+3b-1+7b-2$
$cos^2\theta\:\cdot\:\:sec^2\theta\:\:+cos^2\theta\:\cdot\:\:csc^2\theta\:=csc^2\theta\:$
$\frac{z^6}{z+2}$
$\frac{x^{2\:}-x+1\:}{x}$
$\frac{2x^2}{8x^6}$
$2x^3+6x^2-x-5$
$3a^4b-12a^4b+2a^4b$
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