Find the acute angle between line represented by `xy + y^2 = 0`​

Find the measure of the acute angle between the lines represented by x^(2) + 4xy + y^(2) = 0 .

The acute angle between the lines represented by x^(2) + xy = 0 is….

Find the angle between the lines represented by 3x^2 + 4xy-3y^2 = 0

Find the acute angle between the pair of lines represented by x(cos alpha-y sin alpha)^(2)=(x^(2)+y^(2))sin^(2)alpha

If theta is the acute angle between the lines represented by kx^(2)-4xy+y^(2)=0 and tantheta=(1)/(2) , then k=

Find the measure of the acute angle between the lines represented by (a^(2) - 3b^(2)) x^(2) + 8abxy + (b^(2) - 3a^(2)) y^(2) = 0.

The acute angle between the line represented by 2x^(2)+xy-y^(2)+x+4y-3=0 is

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

The acute angle between the line represented by 2x^(2)-xy-3y^(2)-6x+19y-20=0 is

The acute angle between the line represented by x^(2)-6xy+5y^(2)+10x-4y+9=0 is