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Find the angle between two vectors vec(A...

Find the angle between two vectors `vec(A)=2i+j-k` and `vec(B)=i-k`.

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`cos theta=(vec(A.)vec(*B))/(|vec(A)||vec(B)|)`
`=(2xx1+1xx0+(-1)xx(-1))/(sqrt(2^(2)+1^(2)+(-1)^(2)sqrt(1^(2)+0^(2)+(-1)^(2))))`
`=(3)/(sqrt(6sqrt(2)))=sqrt(3)/(2)theta=30^(@)`
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