Posted by Aman on Saturday, November 19, 2011 at 8:52am.
1.
your 2 vectors are [3,2,-6] and [4,-3,1]
using the dot product
12 - 6 - 6 = √(9+4+36) √(16+9+1) cosŲ, where Ų is the angle between them
0 = .... , no point to go further.
I can see cosŲ = 0
Ų = 90° or π/2 radians
2.
6 + 3 - 2 = √(4+9+1) √(9+1+4) cosŲ
7 = √14√14cosŲ
7 = 14cosŲ
cosŲ = 1/2
Ų = 60° or π/3
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