Direction Cosines Angle Between Lines (Jee Mains) | ExamDuo
3D Coordinates and Direction Ratios
Medium
Direction Cosines Angle Between Lines
Let the direction cosines of two lines satisfy the equations : 4ℓ + m – n = 0 and 2mn + 10nℓ + 3ℓm = 0. Then the cosine of the acute angle between these lines is :