$\left(b-c\right)\left(c-n\right)+4a^2$
$689-\left(-900\right)$
$2y-3y-6y+5y$
$2.6\cos^2\left(1.3\right)$
$\left(y+11\right)\left(y+8\right)$
$-37x-6x$
$2x^2+2x-4$
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