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If the 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

p = -q

B

pq = 1

C

pq = -1

D

p = q

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The correct Answer is:
C
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