$\left(xy^2-y^3\right)\left(xy-y^2\right)$
$\frac{1-\tan^{2}x}{1+\tan^{2}x}=1-2\sin x$
$\frac{dy}{dx}-3x^2=1$
$6m-m$
$64x^2+144xy+81y^2$
$\sqrt{a}+\sqrt{3b}$
$6h\:+\:4\:+\:7h\:$
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