$\lim_{t\to3}\left(\frac{\left(3-t\right)}{\left(\sqrt{t+1\:}-\sqrt{5t-11}\right)}\right)$
$\cot^20\left(1+\tan^20\right)+\csc^20$
$\left(2a+3\right)\left(3a-2\right)$
$216x^6-64y^{12}$
$\frac{m^4-2}{m^2-2}$
$\ln5k$
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