$\lim_{x\to8}\left(x^2-13x+40\right)$
$\int5x\cdot\cos\left(7x\right)dx$
$\left(2-3x\right)\left(1+x\right)\left(x+2\right)$
$2xy+3x+4xy$
$0^9$
$\sqrt{25-0.1x}=\sqrt{9+0.1x}-2$
$\left(5w^5-6\right)\left(5w^5+6\right)-\left(5w^5-6\right)^2$
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