$\left(x^2+\frac{3}{2}x\right)^2$
$\frac{n^2-16}{n+2}$
$x^2-bx$
$2\tan^2x-\sec^2x$
$\left(2z+0.3\right)\left(3z+0.5\right)$
$\frac{8^3+216}{2x+6}$
$x^6-y^8$
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