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If pairs of straight lines x^2-2pxy-y^2=...

If pairs of straight lines `x^2-2pxy-y^2=0`and `x^2-2qxy-y^2=0` be such that each pair bisects the angle between the other pair ,then

A

pq=1

B

pq=-1

C

p+q=1

D

p+q=-1

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The correct Answer is:
B
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