Correct option: (B) 0°
Explanation:
cos θ = {(A➙ ∙ B➙) / (|A| |B|)}
A➙ ∙ B➙ = (4i˄ + 3j˄ – 2k˄) ∙ (8i˄ + 6j˄ – 4k˄)
= (4) (8) + (3) (6) + (– 2) (–4)
= 32 + 18 + 8
= 58
|A| = √(42 + 32 + 22) = √29
|B| = √(82 + 62 (– 4)2) = √116
cos θ = [{58} / {√(29) ∙ √(116)}] = 1
hence θ = 0°