$2x^2+8xy+8y^2-x^2-4xy+4y^2+x^2-4y^2$
$25x^2y^2+10x^2y^2$
$2800\cdot27$
$\int\frac{x^3}{\left(7-x^4\right)^7}dx$
$x^2+4\ge0$
$102,31+3,339$
$\lim_{x\to-4}\left(\frac{x^3+64}{2x+8}\right)$
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