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[" If the pair 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) "p=q," (c) "p=-q(" d) "pq=1]]

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