$2b^2+11b+5$
$\left(2x-3\right)+5-3x-1$
$\cot^2\left(x\right)=\cos^2\left(x\right)$
$3a-7b-2a+5b$
$\frac{9}{\left(1+\csc\left(z\right)\right)^5}$
$\lim_{x\to2}\left(\frac{x^2-4}{3x^2+11x-10}\right)$
$\lim_{x\to-0.5}\frac{sin3x}{tan2x}$
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