$975+859$
$\lim_{x\to9}\left(\frac{\sqrt{x}-3}{x^2-81}\right)$
$\int\frac{x\left(x-3\right)}{x^3-3x-2}dx$
$49x^6-14x^3y^8+y^{16}$
$\int\frac{2x+6}{x\left(x^2+9\right)}dx$
$\left(4a^2b-a^4\right)^3$
$\frac{21^6.35^3.80^3}{15^4.14^9.30^2}$
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