$\lim_{x\to0.9}\left(\frac{2x+1}{x-1}\right)$
$\left(6x+\frac{5}{7}\right)\left(6x-\frac{5}{7}\right)$
$\frac{dy}{dt}=3t\left(5-y\right)$
$\frac{-6x+3}{2x+1}$
$-2x^2+3x+3$
$\frac{\cot\left(b\right)^2-1}{\cot\left(b\right)^2}=1$
$x^2-11x$
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