If the angle between the lines given by `6x^(2)+xy+ky^(2)=0` is `45^(@)`, then k=

If 7x^(2)-kxy-7y^(2)=0 represents the joint equation of the bisectors of the angles between the lines given by 2x^(2)-7xy+4y^(2)=0 , then k=

If the angle between the lines given by (tan^(2)A)x^(2)-kxy-y^(2)=0 is 2A, then k=

The joint equation of bisectors of the angles between the lines given by 5x^(2)+6xy-y^(2)=0 , is

If the angle between the lines given by ax^(2)+2hxy+by^(2)=0 is equal to the angle between lines given by 2x^(2)-5xy+3y^(2)=0 , then

The angle between the lines in x^(2)-xy-6y^(2)-7x+31y-18=0 is

The angle between the lines in x^(2)-xy-6y^(2)-7x+31y-18=0 is

The angle between the lines in x^(2)-xy-6y^(2)-7x+31y-18=0 is

If the angle between the lines ax^(2)+xy+by^(2)=0 is 45^(@) , then

The angle between the lines x^(2) + 4xy + y^(2) = 0 is

The acute angle between the lines represented by 6x^(2)-xy-y^(2)=0 is