$\lim_{x\to0}\left(\frac{\cos\left(x-\frac{\pi}{2}\right)}{x}\right)$
$2\left(n+1\right)+3n\left(6n-1\right)$
$\frac{d}{dx}\frac{e^2y}{b^2x}$
$\frac{d}{dx}y=x\sqrt{x^2+43}$
$+8-7+6-5+6-4-2+15$
$\left(xe^{y^2}-1\right)dx+x^2ye^{y^2}dy=0$
$\frac{du}{dt}=4t^3u^2$
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