1.

A and B are two points on the hyperbola O is the centre. If OA is perpendicular to OB then (1)/(OA)^(2)+(1)/(OB)^(2) is equal to

Answer»

`(1)/(a^(2))+(1)/(B^(2))`
`(1)/(a^(2))-(1)/(b^(2))`
`(1)/(b^(2))-(1)/(a^(2))`
`a^(2)+b^(2)`

ANSWER :b


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