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The straight line lx + my =1 intersects ...

The straight line `lx + my =1` intersects `px^2 +2qxy + ry^2 = s` at AB. Chord AB subtends a right angle at the origin. If `lx + my = 1` is a tangent to a circle `x^2 + y^2 = a^2`, then `a =`

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