$\lim_{x\to-1}\left(2x^2+1\right)\left(1-2x\right)^2$
$\left(4k+17\right)\left(4k-17\right)$
$\frac { x ^ { - 6 } y ^ { - 1 } y } { x ^ { 2 } }$
$x^2\le4$
$\left(x^2+y^2-1\right)^2$
$225m^2+60m\:+\:4$
$\left(4a^2-2ab+b^2\right)\cdot\left(12ab^2\right)$
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