# Double straight lines, find value of p*q?

If the pair of lines x² - 2pxy - y² = 0 and x² - 2qxy - y² = 0 are such that each pair bisects the angle between the other pair, then pq equals?

Please do not use equation of joint bisector. Is there other way round?

Please do not use equation of joint bisector. Is there other way round?

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