$\left(-1\right)^n\left(\frac{n^2}{2n^3+1}\right)$
$\lim_{x\to2}\left(5^x+2^x+4\right)$
$\frac{d}{dx}\left(\frac{x^n}{n}\right)$
$6x^2-23x+4$
$\int7x^{\frac{3}{4}}dx$
$4z^2+8z+4=0$
$5x^3+4x^3-\frac{1}{5}x^3$
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