$-2x^2-41x-106=-13$
$2a+4a+2$
$\frac{d}{dx}\left(x-2\right)$
$\left(-328\right)\left(-657\right)$
$\frac{x^2}{2}+xy-\frac{y^2}{2}$
$\:\left(-5\right)\:.\:\left(-8\right)\:.\:\left(-4\right)\:-\:6\:.\:\left(-2\right)\:-\:\left(3\right).\left(-4\right).\left(-2\right)\:$
$\left(xz-yw\right)\left(xz+yw\right)$
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