$5x^3y\left(3x^5y^5+2x^3y^2-11xy\right)$
$\left(m+n+z\right)^2$
$225x^2+45xy+9y^2$
$\lim_{x\to4}\left(\frac{x^4-18x^2+81}{\left(x-3\right)^2}\right)$
$\frac{dy}{dx}+\frac{y}{2}=2+x$
$-3ab+6a^2;\:a=-1;\:b=3$
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