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)+2pxy-ay^(2)=0 and bx^(2)+2qxy-by^(2)=0 be such that each bisects the angles between the other, then (a) p = –q (b) pq = 1 (c) pq = -1 (d) p = q.

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

If the pairs 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 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 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 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