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

The angle between the lines 6x^(2)+5xy-6y^(2)=0 is

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

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

The angle between the lines 3x^(2)+7xy+2y^(2)+5x+5y+2=0 is given by

The angle between the lines 3x^(2)+7xy+2y^(2)+5x+5y+2=0 is given by

The angle between the lines 3x^(2)+7xy+2y^(2)+5x+5y+2=0 is given by

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=

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

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

The angle between the lines 2x^2-7x y+3y^2=0 is 1. 60^0 2. 45^0 3. tan^(-1)(7//6) 4. 30^0