$\frac{1-e^x}{\tan\left(x\right)}$
$-45-54+-24$
$\lim_{x\to0}\left(\frac{e^{-x^2}}{x^{-1}}\right)$
$\frac{420}{-7}$
$v^2-12v$
$\frac{d^2}{dx^2}\sqrt{4-x^2}$
$-45:\:-\:7$
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