The angle between twovectors 2 hat(i) + 3 hat(j) + hat(k) and - 3 hat(i) + 6 hat(k)is :

The angle between twovectors 2 hat(i) + 3 hat(j) + hat(k) and - 3 hat(

1.	The angle between twovectors 2 hat(i) + 3 hat(j) + hat(k) and - 3 hat(i) + 6 hat(k)is :
Answer» `0^(@)` `45^(@)` `60^(@)` `90^(@)` Solution :`A. B = (2 hat(i) + 3 hat(j) + hat(k)) * (- 3 hat(i) + 6 hat(k))` = - 6 + 6 = 0 Since A.B = 0 the angle between two vectors is `90^(@)`