$\lim_{x\to0}\left(\frac{\sqrt{x^2-4}}{2x}\right)$
$\int\left(\sin2t\:\cos^42t\right)dt$
$\frac{d}{dx}\left(xe^y\right)=\left(x^2-y^2\right)$
$x^2+y^2=\left(x+y\right)^2-2xy$
$\int\frac{2x+1}{3x+1}dx$
$\int\left(\frac{1}{\left(1+16x\right)}\right)dx$
$5x^2-20x+4$
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