$x^2-yx^2+\frac{dx}{dy}\left(y^2+xy^2\right)$
$g+g+g$
$3n-4\left(-5n+7\right)$
$\cos\left(x+90\right)+6\sin\left(x\right)$
$\left(x-\frac{1}{x}\right)^2$
$4\cdot\left(3x+4\right)-6-6x$
$\left(\frac{x+2}{x-2}-\frac{x-2}{x+2}\right)$
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