$\frac{d}{dx}x^3+e^x$
$-23-22-21$
$4x+10=2x$
$-6n=-8n-2$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{1+sec\left(x\right)}{tan\left(x\right)}\right)$
$\left(2x^3-7y^3\right)^2$
$-82+2$
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