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If the pair of lines \(x^2 - 2pxy - y^2 = 0\) and \(x^2 - 2qxy - y^2 = 0\) are such that each pair bisects the angle between the other pair, then pq equals.
(a) \(-1 \)
Updated Wed, 10 Oct 2018 11:31 am
Which of the following statement is not correct with respect to malaria?