$6x^2+\:7x^3$
$\frac{1}{1-\cos\left(x\right)}-\frac{1}{1+cos\left(x\right)}=2csc^2x$
$x^5-9x^3=0$
$4x-5x^3$
$6-x-x^2$
$\left(9a+7b^2\right)\left(81a^2-63ab^2+49b^4\right)$
$x^2-20x=0$
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