If e and e? are eccentricities of hyperbola and its conjugate respecti

1.	If e and e? are eccentricities of hyperbola and its conjugate respectively, then [UPSEAT 1999]
A.	\[{{\left( \frac{1}{e} \right)}^{2}}+{{\left( \frac{1}{e'} \right)}^{2}}=1\]
B.	\[\frac{1}{e}+\frac{1}{e'}=1\]
C.	\[{{\left( \frac{1}{e} \right)}^{2}}+{{\left( \frac{1}{e'} \right)}^{2}}=0\]
D.	\[\frac{1}{e}+\frac{1}{e'}=2\]
Answer» B. \[\frac{1}{e}+\frac{1}{e'}=1\]

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If e and e? are eccentricities of hyperbola and its conjugate respectively, then [UPSEAT 1999]

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