Find the angle between the lines
`2x - y + 3 = 0 and x + y - 2 = 0`.

Find the bisector of acute angle between the lines x+y - 3 = 0 and 7x - y + 5 = 0

Find the equation of thebisector of the angle between the lines 2x-3y - 5 = 0 and 6x - 4y + 7 = 0 which is the supplement of the angle containing the point (2,-1)

Find the acute angles between the st. lines : 2x-y+3=0 and x+y-2=0 .

Find the angle between them 2x-y+3z-1=0 and 2x-y+3z=0.

Find the angle between the planes 2x+y+z-1=0 and 3x+y+2z-2=0 ,

Find the angle between two planes 2x+y-5z=0 and 4x -3y+7z=0

The angle between the lines 2x = 3y=-z and 12x=-2y=-8z is:

Find the acute angles between the st. lines : y-3x-5=0 and 3y -x +6= 0 .

Find the equation of the bisector of the obtuse angle between the lines 3x-4y+7=0 and 12 x+5y-2=0.