$+47-23-45-100$
$\frac{1+\sec\left(x\right)^2}{1+\tan\left(x\right)^2}=\frac{3}{2}$
$\frac{\csc\:\left(x\right)^2-1}{\csc\:\left(x\right)^2}$
$\lim_{x\to9}\left(\frac{x^2-81}{x+4}\right)$
$125x^3-729y^3$
$\left[2\left(3-5\right)-1\right]$
$\left|-4\right|-\left|-1\right|$
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