$\frac{d}{dx}\left(y^4+x^4-2x^2y^2\right)$
$\cos\left(z\right)=\sin\left(z\right)$
$\frac{x^3-27}{x^2+9x+9}$
$\:\:8x^2-26x-7$
$\left(3x+1\right)\left(2x+6\right)-\left(x+7\right)\left(x-7\right)$
$x^2y+xy^2+y$
$\left(30-2x\right)\left(72-2x\right)x$
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