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Question

Find the angle between the vectors A=^i+2^j^k and B=^i+^j2^k.

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Solution

Given : A=^i+2^j^k B=^i+^j2^k
A.B=1+2+2=3
|A|=11+22+12=6
|B|=11+12+22=6
cosθ=A.B|A||B|
Or cosθ=36×6=12
θ=60o

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