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The lines joining the origin to the poin...

The lines joining the origin to the point of intersection of `x^2+y^2+2gx+c=0 and x^2+y^2+2fy-c=0` are at right angles if

A

`g^2+f^2=c`

B

`g^2-f^2=c`

C

`g^2-f^2=2c`

D

`g^2+f^2 =c^2`

Text Solution

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The correct Answer is:
c
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