$\left(2a+3\right)\left(2a-9\right)$
$4-3\cdot\left[2\cdot\left(-7+4\right)-\left(2-5\right)\cdot3-1\right]$
$2x^2+x^2\sqrt{x}-1$
$\lim_{x\to1}\left(\frac{x^2+xy-\:2}{1-xy}\right)$
$\left(8\right)\left(5xyz\right)^0$
$\left(\sqrt{3+5}\right)\left(\sqrt{3-5}\right)$
$\int\left(\frac{x^3}{1-3x^4}\right)dx$
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