$\int_{-1}^{\infty}\frac{x^8}{\left(1+x^6\right)^2}dx$
$\int27dx$
$-21a^2.b^2:7ab^2$
$\int\left(6x^{-3}\right)dx$
$\lim_{x\to0}\left(\frac{x^2}{\sqrt{x^2+12}-12}\right)$
$4n-8\le6$
$\left(3x^2+8x+4\right)\left(x-2\right)$
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