$\left(-3\right)\left(-6\right)\left(-7\right)$
$\frac{x^2+3x+2}{-3x^2+19x-6}$
$\frac{\cot\left(a\right)-1}{1+\tan\left(-a\right)}$
$\left(2b-1\right)\left(6+2b\right)$
$9.50+9.50+9.50+9.50$
$.\:\:\:t^3\:dr+r^5\:dt\:$
$\int\frac{2x^3-x^2-6x-9}{x^2-x-2}dx$
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