$x^4-2x^2+3$
$x^2-4x+5<0$
$\left(-\frac{7a^2b^3c^0}{3a^2b^3c^7}\right)^{-4}$
$\frac{d}{dx}\left(y=e^{\frac{y}{x}}\right)$
$\lim_{x\to0}\left(\frac{1-cos8x}{8x^2}\right)$
$2-3+4+1-8+2$
$\left(n^3+4\right)\left(n^y+4\right)$
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