Two vectors `vec(A) = hat(i) + 2 hat(j) + 2 hat(k) and vec(B) = hat(i) + 3 hat(j) + 6 hat(k)` find .
angle between them .

Explanation

`vec(A) = hat(i) + 2 hat(j) + 2 hat(k)`
`vec(B) = hat(i) + 3 hat(j) + 6 hat(k) `
Angle between vectors `vec(A) and vec(B)` `:. cos theta = (vec(A) . vec(B))/(AB)`
(or) `cos theta = (19)/(3 sqrt(46))`
`theta = cos ^(-1) ((19)/(3 sqrt(46)))`