$81c^2+108pq+36q^2$
$\left(-2x^3y^3-11-17x^5y^2\right)$
$\int_{-2}^1\frac{1}{x^2}dx$
$5\sqrt{98}-3\sqrt{18}$
$\left(x-4\right)\left(x-9\right)-\left(x-6\right)^2$
$\left(n+8a\right)\left(n-5a\right)$
$\lim_{x\to0}\left(\frac{8^x-7^x}{x}\right)$
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