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

If the pair of straight lines ax^(2)-2pxy-y^(2)=0and x^(2)-2qxy-y^(2)=0 are such that each pair bisects the angle between the other pair , then prove that pq=-1 .

If pairs of lines 3x^(2)-2pxy-3y^(2)=0 and 5x^(2)-2qxy-5y^(2)=0 are such that each pair bisects then angle between the other pair then pq=

If the pairs of straight lines ax^(2)+2hxy-ay^(2)=0 and bx^(2)+2gxy-by^(2)=0 be such that each bisects the angles between the other, then

If the pairs of straight lines ax^2+2hxy-ay^2=0 and 'bx^2+2gxy-by^2=0 be such that each bisects the angles between the other , then

If the pair of lines ax^2-2xy+by^2=0 and bx^2-2xy+ay^2=0 be such that each pair bisects the angle between the other pair , then |a-b| equals to