$\int x^2\sec^2\left(2x^3\right)dx$
$4+5y-2\left(5+2y\right)=6$
$\left(6b+4a-5c\right)^2$
$\left(z-8\right)^2$
$c-3\left(c+1\right)$
$\left(x^2-2x+3\right)\left(x^2+x-3\right)$
$ab+4a^2$
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