1.

For the system of circles given by (x^(2)+y^(2)+2gx)+lambda(x^(2)+y^(2)+2fy+l)=0, "where " g ne 0, f ne 0 " and " lamda is a parameter, if the line joining the points circles of the system subtends a right angle at the origin, thenk/f^(2)=

Answer»

-1
1
2
`1/2`

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