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If the pair of straight lines x^(2)-2pxy...

If the pair of straight lines `x^(2)-2pxy-y^(2)=0and x^(2)-2qxy-y^(2)=0` are such that each pair bisects the angle between the other pair , then prove that `pq=-1`.

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The correct Answer is:
`1/(-p)=(-2q)/(-2)=(-1)/p rArr pq=-1`
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