The denominator of \[\frac{a+\sqrt{{{a}^{2}}-{{b}^{2}}}}{a-\sqrt{{{a}^{2}}-{{b}^{2}}}}+\frac{a-\sqrt{{{a}^{2}}-{{b}^{2}}}}{a+\sqrt{{{a}^{2}}-{{b}^{2}}}}\]is ______.

\[\frac{4{{a}^{2}}-2{{b}^{2}}}{{{b}^{2}}}\]

The denominator of \[\frac{a+\sqrt{{{a}^{2}}-{{b}^{2}}}}{a-\sqrt{{{a}^

1.	The denominator of \[\frac{a+\sqrt{{{a}^{2}}-{{b}^{2}}}}{a-\sqrt{{{a}^{2}}-{{b}^{2}}}}+\frac{a-\sqrt{{{a}^{2}}-{{b}^{2}}}}{a+\sqrt{{{a}^{2}}-{{b}^{2}}}}\]is ______.
A.	\[{{a}^{2}}\]
B.	\[{{b}^{2}}\]
C.	\[{{a}^{2}}-{{b}^{2}}\]
D.	\[\frac{4{{a}^{2}}-2{{b}^{2}}}{{{b}^{2}}}\]
Answer» C. \[{{a}^{2}}-{{b}^{2}}\]

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The denominator of \[\frac{a+\sqrt{{{a}^{2}}-{{b}^{2}}}}{a-\sqrt{{{a}^{2}}-{{b}^{2}}}}+\frac{a-\sqrt{{{a}^{2}}-{{b}^{2}}}}{a+\sqrt{{{a}^{2}}-{{b}^{2}}}}\]is ______.

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