APPLY the L'Hopital rule. L = \(\displaystyle\lim_{x \rightarrow 0}\frac{ \dfrac{d}{DX}(\sqrt{1+x}-\sqrt{1-x})}{\frac{d}{dx}(x)}\)\(L =\frac{\frac{1}{2\sqrt{1+x}}-\frac{1}{2\sqrt{1-x}{}}(-1)}{1}\)\(L={1\over 2 }+{1\over 2} = 1\)