$x^8-y^4$
$x^2\left(a-2\right)+y^2\left(a-2\right)$
$3x^5\cdot 2 x^2$
$10n^2-6n+15n^2+22n$
$\frac{\cot\left(x\right)\cos\left(x\right)}{\sin\left(x\right)}=\cot^2\left(x\right)$
$9x^2y^5-6xy^7+21x^3y^{11}$
$15x^2-6x+5$
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