$36c^2-54c+81$
$2xy+xy$
$\:\:\:10\left(60\right)-18$
$28x\:-\:69xy\:-\:22y\:-\:36x\:-\:71y\:-\:40$
$\cos\left(\sin\left(\frac{3}{5}\right)-\sin\left(\frac{2}{3}\right)\right)$
$5n-n$
$\frac{x-3y}{x^2-y^2}+\frac{1}{x+y}-\frac{1}{x-y}$
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