$\left(\sec x+\tan-1\right)\left(1+\sec x-\tan x\right)=2\tan x$
$\left(3x+90\right)\left(x-80\right)$
$-\frac{5}{21}x^3y-\frac{-3}{28}x^3y+\frac{1}{42}x^3y$
$\left(\frac{1}{2}xy^2+2x^2y\right)^3$
$\left(x+4y+z\right)\left(x-4y-z\right)$
$45\cdot11$
$18a^2-3a-6$
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