$x+x^3-x$
$area\left(x+6\right)^3$
$\left(\left(x-3\right)+3a\right)\cdot\left(\left(x-3\right)-4a\right)$
$\frac{1}{\csc^2x}+\cos^2x=1$
$\left(2m^2+3n^a\right)^2$
$\left(5x-3y^2\right)\left(5x+3y^2\right)$
$4c^2+16cd-16d^2$
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