$\left(5ac-10ab\right)^2$
$\frac{4x^3-8x^4+14x^2}{2x^2}$
$2<-8-u$
$4a^3b^2+16a^2b+6a^2-4b^2-2$
$x^5+\frac{x^4}{2}-16x-8$
$49x^2+56x+7$
$\frac{1}{\left(sec\left(x\right)+tan\left(x\right)\right)}$
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