$\left(7x+x^4\right)^2$
$\lim_{x\to1}\left(x^{11}-1\right)$
$xy\frac{dy}{dx}=\frac{x^4}{y^4}$
$\left(x-\frac{1}{2y}\right)^4$
$3a^2+8a+5$
$n^2+8n+15$
$m^2+7n-8c+d-m^2-9n-11c-14$
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