$21x^8y^5\:63x^5y^{2\:}45x^4y^3$
$\left(y^2+xy^2\right)\cdot\frac{dx}{dy}=1$
$-7x^2+12x+36$
$\left(3x^3yv-4a^2b\right)\left(3xyv-4ab^3\right)$
$\frac{t^5}{\left(t^3+1\right)^2}$
$\left(\sqrt{x+5}-4\right)\left(\sqrt{x+5}+4\right)$
$5x+6<6x+10$
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