| p{4cm} p{4cm} p{3cm}} (1) $-2$ | (2) $2$ | (3) zero | (4) does not exist. |
\textbf{114-} What is the value of $\displaystyle\lim_{x \to 0}\left([2x]+[-2x]\right)\dfrac{1-\cos^2 x}{1-\sqrt{1+x^2}}$? (The symbol $[\,]$ denotes the floor function.)
\begin{tabular}{p{4cm} p{4cm} p{4cm} p{3cm}}
(1) $-2$ & (2) $2$ & (3) zero & (4) does not exist.
\end{tabular}
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