$\left(x+12y\right)\left(x+2y\right)$
$\frac{7x^2}{2}-2x$
$\lim_{x\to0}\left(\frac{3x^2}{\sin\left(2x\right)\cdot\sin\left(4x\right)\cdot\sin\left(3x\right)}\right)$
$5.400-3875$
$9x^2-4\left(y-2\right)^2$
$-1-25$
$\left(7a^2\:+\:2b^3\right)^2\:$
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