JEE Math Practice Question
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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