\[\frac{{{\mathbf{a}}^{\mathbf{-1}}}}{{{\mathbf{a}}^{\mathbf{-1}}}\mathbf{+}{{\mathbf{b}}^{\mathbf{-1}}}}\mathbf{+}\frac{{{\mathbf{a}}^{\mathbf{-1}}}}{{{\mathbf{a}}^{\mathbf{-1}}}\mathbf{-}{{\mathbf{b}}^{\mathbf{-1}}}}\mathbf{=?}\]

\[\frac{2{{b}^{2}}}{{{b}^{2}}+{{a}^{2}}}\]

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

\[\frac{{{\mathbf{a}}^{\mathbf{-1}}}}{{{\mathbf{a}}^{\mathbf{-1}}}\mat

1.	\[\frac{{{\mathbf{a}}^{\mathbf{-1}}}}{{{\mathbf{a}}^{\mathbf{-1}}}\mathbf{+}{{\mathbf{b}}^{\mathbf{-1}}}}\mathbf{+}\frac{{{\mathbf{a}}^{\mathbf{-1}}}}{{{\mathbf{a}}^{\mathbf{-1}}}\mathbf{-}{{\mathbf{b}}^{\mathbf{-1}}}}\mathbf{=?}\]
A.	0
B.	1
C.	\[\frac{2{{b}^{2}}}{{{b}^{2}}-{{a}^{2}}}\]
D.	\[\frac{2{{b}^{2}}}{{{b}^{2}}+{{a}^{2}}}\]
Answer» D. \[\frac{2{{b}^{2}}}{{{b}^{2}}+{{a}^{2}}}\]

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\[\frac{{{\mathbf{a}}^{\mathbf{-1}}}}{{{\mathbf{a}}^{\mathbf{-1}}}\mathbf{+}{{\mathbf{b}}^{\mathbf{-1}}}}\mathbf{+}\frac{{{\mathbf{a}}^{\mathbf{-1}}}}{{{\mathbf{a}}^{\mathbf{-1}}}\mathbf{-}{{\mathbf{b}}^{\mathbf{-1}}}}\mathbf{=?}\]

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