Find the equation of the planes bisecting the angles between planes `2x+y+2z=9 and 3x-4y+12z+13=0`

Find the equations of the bisectors of the angles between the planes 2x-y+2z+3=0 and 3x-2y+6z+8=0 and specify the plane which bisects the acute angle and the plane which bisects the obtuse angle.

Find the equation of the bisector planes of the angles between the planes 2x-y+2z-19=0 and 4x-3y+12z+3=0 and specify the plane which bisects the acute angle and the planes which bisects the obtuse angle.

The equation ofthe plane which bisects the angle between the planes 3x-6y+2z+5=0 and 4x-12y+3z-3=0 which contains the origin

Find the angle between the plane: 2x+y-2z=5 and 3x-6y-2z=7

Find the angle between the planes x+y+2z=9 adn 2x-y+z=15

Find the angle between the planes x-y+2z=9 and 2x+y+z=7 .

Find the angle between the planes -x+y+2z=9 and x+2y+z=5

Find the angle between the plane: 2x-y+z=6 and x+y+2z=7

What is the angle between the planes 2x-y-2z+1=0 and 3x-4y+5z-3=0 ?