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 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 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 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 x^(2) + 4xy + y^(2) - 2x + 2y -6=0 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

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