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The pair of lines joining origin to the points of intersection of, the two curves `ax^2+2hxy + by^2+2gx = 0` and `a^'x^2 +2h^'xy + b^'y^2 + 2g^'x = 0` will be at right angles, if

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The correct Answer is:
`therefore (a+b)g'=(a'+b')g`.
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