$\lim_{x\to1}\left(\frac{x^4-x^3}{x-1}\right)$
$\left(n^3+n^2-3\right)\left(n^3+n^2+3\right)$
$\left(d^5-7x^6\right)^2$
$\left(-3x^{5}\right)\left(6x^{7}\right)$
$2^3-\sqrt{36}$
$\frac{m^4+32}{m-2}$
$\sqrt{xy^2}\cdot\sqrt{x^3y^7}$
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