$27-12-8+33+14-17-19$
$237-1036+456-215$
$\lim_{x\to0}\left(\frac{\sqrt{1+x^2}-1}{\sqrt{1-x^2}-1}\right)$
$\frac{d^2}{dx^2}\left(f\left(x\right)=\frac{x^3}{2}\right)$
$y=\frac{2}{3}x-1$
$27-48x^4$
$\left(2x+3\right)^2\left(2x+1\right)^2$
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