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if OA and OB are equal perpendicular c...

if ` OA ` and `OB `are equal perpendicular chords of the circles ` x^2 +y^2-2x+4y =0`, then the equations of ` OA ` and `OB ` are where O is the origin, (i) `3x+y=0` and `3x-y=0` (ii) `3x+y=0` and `3y-x=0` (iii) `x+3y=0` and `y-3x=0` (iv) `x+y=0` and `x-y=0`

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