The angle between vec(A) = hat(i) = 2hat(j) - hat(k) and vec(B) = - hat(i) + hat(j) - 2hat(k) is

The angle between vec(A) = hat(i) = 2hat(j) - hat(k) and vec(B) = - ha

1.	The angle between vec(A) = hat(i) = 2hat(j) - hat(k) and vec(B) = - hat(i) + hat(j) - 2hat(k) is
Answer» `30^(@)` `45^(@)` `60^(@)` `90^(@)` Answer :C