The angle of rotation of axes to remove xy term in the equation `x^(2) + 4xy + y^(2) - 2x + 2y -6=0` is

The angle of rotation of axes to remove xy term in the equation xy = c^(2) is

The angle of rotation of axes to remove xy term of the equation xy = c^(2) is

The angle of rotation of axes to remove xy terms in the equation 3x^(2) - 2 sqrt(3) xy + 9y^(2) = 10 is

The angle of rotation of axes to remove xy terms in the equation 9x^(2) - 2sqrt(3)xy + 3y^(2)=0 is

The angle of rotation of axes to remove xy term in the equation 9x^(2) + 2sqrt(3)xy + 7y^(2)=10 is

The angle of rotation of axes to remove xy term in the equation 9x^(2) + 2sqrt(3)xy + 7y^(2)=10 is

The angle of rotation of axes in order to eliminate xy term in the equation x^(2) + 2sqrt(3)xy - y^(2) = 2a^(2) is

Find the angle through which the axes be rotated to remove the xy term from the equations x^(2) + 4xy + y^(2) - 2x + 2y - 6 = 0