$\frac{x^2+x-1}{3-x}$
$\frac{dy}{dx}=2x\cdot e^y$
$\lim_{x\to0}\left(\frac{cos\left(8x\right)-cos\left(6x\right)}{x^2}\right)$
$64-16+1$
$\sqrt{14a}$
$\sin x^2+5\cos x+13$
$\frac{dy}{dt}+x=0$
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