$-54:-3$
$50-400+800+63-8$
$\lim_{x\to\infty}\left(\frac{e^x-e^{-x}-2x}{x-\sin\left(x\right)}\right)$
$\left(2ab^2+7b^6\right)^2$
$\frac{\cos\left(x\right)-\sin\left(x\right)}{1-\tan\left(x\right)}$
$4n-6\left(4n-4\right)$
$\frac{dy}{dx}=\frac{2y}{2x}$
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