$\left(2x-y^2+5w\right)^2$
$4x^2-100y^2$
$\frac{x^{20}}{\left(x+4\right)^2}$
$\lim_{x\to-3}\left(x^2+2x-7\right)$
$x^2-10x\le-25$
$8x^2+2x-10x^2+4$
$4a+b^2;\:a=2;\:n=-1$
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