$a^3+a^2-a$
$4b^2\left(x-2\right)+9x\left(x-2\right)$
$\left(-2w^2xy^3\right)^3\left(-4w^2y\right)^2$
$x^2+x<x+2$
$5x^2-6x-1$
$\frac{81-x^4}{9-x^2}$
$9\:\left(cos\:x\right)^3-15\:\left(cos\:x\right)^2-6\:\cos\left(x\right)=0$
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