$\frac{x^2}{2x-x^2}$
$-3m^3-7m^3$
$\lim_{x\to\sqrt{5}}\left(\frac{x-\:\sqrt{5}}{x^2-5}\right)$
$\lim_{x\to-\infty}\left(\left(x^3+3x^2+5\right)\left(5-8x^2\right)\right)\:\:$
$cos\left(2x-90\right)=0$
$2\log\left(x\right)=\log\left(30+x\right)$
$\frac{\csc\left(x\right)^2-2}{\csc\left(x\right)^2}=\cos\left(2x\right)$
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