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If O Aa n dO B are equal perpendicular c...

If `O Aa n dO B` are equal perpendicular chords of the circles `x^2+y^2-2x+4y=0` , then the equations of `O Aa n dO B` are, where `O` is the origin. `3x+y=0` and `3x-y=0` `3x+y=0` and `3y-x=0` `x+3y=0` and `y-3x=0` `x+y=0` and `x-y=0`

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