$9n^3+15n^2$
$\lim_{x\to+\infty}\left(\frac{\sqrt{3x^2+2x+1}}{2x+7}\right)$
$4x^2+1x+49$
$\int x^5ln\left(x^5\right)dx$
$\lim_{x\to0}\tan\left(x\right)^{\sqrt{x}}$
$12x^2+144x-12$
$\frac{1}{2}b+\frac{1}{4}b-\frac{1}{6}b$
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