3x−6y+2z+5=0 −4x+12y−3z+3=0 Bisectors are ‌
3x−6y+2z+5
√9+36+4
=±‌
−4x+12y−3z+3
√16+144+9
The plane which bisects the angle between the planes that contains the origin. 13(3x−6y+2z+5)=7(−4x+12y−3z+3) 67x−162y+47z+44=0 Further, 3×(−4)+(−6)(12)+2×(−3)<0 Hence, the origin lies in the acute angle.