$\lim_{x\to4}\left(\frac{x-4}{\sqrt{x^2-16}}\right)$
$\frac{x^3+6x^2-13x-42}{x-3}$
$-5+1-\left(-8\right)$
$-6\sin\left(2x\right)-4cos\left(x\right)=0$
$\frac{dy}{dx}+xy=-4x$
$\int_0^{\pi}\left(1-\sin x\right)dx$
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