$2w^2-w-1$
$\frac{1}{x+3}\le2$
$2\sin^2x-\tan x=0$
$\frac{x+y}{x-y}\:+\frac{x-y}{x+y}$
$a^3-a^4-b^2a+b^2a^2$
$\frac{t-5}{t^3-3t^2-10t}$
$x^2-x+6=0$
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