$\left(2x-4y\right)^2-\left(x+2y\right)^2$
$\frac{y^{-4}}{y^6}$
$\left|-23-\left(-7\right)\right|$
$4x+2\left(x-1\right)\le3\left(x+2\right)$
$\left(a^2+2\right)\left(a^2+10\right)$
$6x^3+5x^2-19x-10$
$c\sec a=\frac{12}{5}$
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