$\frac{\tan x-\left(\tan x\right)^{2}}{1+\tan x^{2}}$
$\left(11w-bg\right)\left(11w-5\right)$
$a^4+3a^2\:-10$
$\frac{z^2-18z}{z}$
$\frac{x^{2}}{36}+xy+9y^{2}$
$6ab^2c^3+6a^2b^2c^2+18a^3bc^2$
$349-\frac{6}{x^2}-15x-\frac{15}{x}-6x^2$
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