$4m+5m+7m-m$
$100x^2-9y^2$
$2\cos^2\left(x\right)-1=1-2sin$
$logx=logx^2-12$
$\frac{x^2y}{xy}$
$34-65+89+87-765$
$\lim_{x\to-1}\left(\frac{x^2-2x+1}{x^2-1}\right)$
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