$\left(a^2-8a-2\right)\left(-a^2+3a-1\right)$
$10\left(cos30+isen30\right)$
$4<2x-3$
$\frac{dy}{dx}=x-x\cdot y-y+1$
$\int x ^ { - 37 } d x$
$4\sin u\cos^2-\sin u=0$
$\lim_{y\to3}\left(17-y^2\right)^{\frac{1}{3}}$
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