$\left(2mn^2\right)\cdot\left(4mn\right)$
$\left(9n^2c\right)^3$
$\frac{a+3}{8}+\frac{a}{5}=2$
$7x-3<12-2x$
$sin\left(x-39.3\right)=0.673$
$130:-10$
$\lim_{x\to0}\left(\frac{2sinxcosx}{x}\right)$
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