$\lim_{x\to-\infty}\left(\frac{4x}{\sqrt{x^2-1}}\right)$
$3x^4+x^2$
$\frac{-5x^2-x^4+x^2-2}{x^2+1}$
$\left(1+\sqrt[2]{3}x\right)\left(1-\sqrt[2]{3}x\right)$
$2x-7=9$
$1\:-2\:-26\:27\:-90$
$.1125=e$
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