$\log\left(4x+2x\right)$
$\frac{x^2+4x-8}{x^2-1}$
$\tan\left(x-180\right)$
$m^4+7m^2+17$
$\frac{3}{5}x^2+15x=-1$
$4k^2-12k$
$-4xy^3-5xy^3+\sqrt{2xy^3}$
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