$\lim_{x\to0}\left(\frac{\sqrt{-1}}{n\pi}\right)$
$\left(1\right)^2-3\left(1\right)+3$
$\frac{d}{dx}\:ln\left(x^2\right)x^4$
$a+ax=b$
$sec\:\left(x\right)-3=0$
$4.33\cdot10^8$
$\frac{8x+6}{x}$
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