1.

If the coordinates of four concyclic point on the rec­tangular hyperbola xy =c^(2) are i=1,2,3,4 then

Answer»

`t_(1)t_(2)t_(3)t_(4)=-1`
`t_(1)t_(2)t_(3)t_(4)=1`
`t_(1)t_(3)=t_(2)t_(4)`
`t_(1)t_(2)t_(3)t_(4)=C^(2)`

ANSWER :b


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