Question : If A⃗ =2î+ 3ĵ+ 4k̂ and B⃗ = 4î+ 3ĵ+ 2k̂, then angle between A⃗ and B⃗ is
(A) \sin ^{-1} (25/29)
(B) \sin ^{-1} (29/25)
(C) \cos ^{-1} (25/29)
(D) \cos ^{-1} (29/25)
Answer : option (C)
Solution :
If A⃗ =2î+ 3ĵ+ 4k̂ and B⃗ = 4î+ 3ĵ+ 2k̂, then angle between A⃗ and B⃗ is
with
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