$x^2-30x+225=441$
$3\left(m+n\right)-108$
$\frac{dy}{dx}=2x+\frac{y}{x-1}$
$-7\left(-5\right)\left(-6\right)$
$8cot^2x+12cot\:x-8$
$9-p^2\:p^2$
$\frac{6x^34-x^2+2x-1}{x^2-1}$
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