$\lim_{x\to0}\frac{x^2+x+\sin\left(2x\right)}{x}$
$\lim_{x\to\infty}\left(\frac{-1}{2}\right)^{\left(x-1\right)}$
$\frac{sin\:\left(a+b\right)}{sin\left(a\right)cos\left(b\right)}$
$\frac{\frac{3.999}{3.999+1}-\frac{4}{5}}{3.999-4}$
$\frac{x^n}{\left(4\right)^n\left(\sqrt{n}+7\right)}$
$\sin\left(x\right)=-\frac{3}{2}$
$-92-12$
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