$4-x^6$
$y+1-y$
$\frac{27n^3-125n^3}{3m-5n}$
$\:\frac{16m^6n^4}{-5n^3}\:$
$\frac{dy}{dx}=\sec y$
$\left(\sqrt{7}+\sqrt{2}\right)\left(\sqrt{7}-\sqrt{2}\right)+\left(5-\sqrt{3}\right)\left(5+\sqrt{3}\right)$
$x^{4}-6x^{3}-21x^{2}+74x+168$
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