If vector A and B are two non collinear unit vectors and if |A+B|= $sqrt{3}.$ , then find the value of (A-B).(2A+B)

Please help! :O

Question

If vector A and B are two non collinear unit vectors and if
|A+B|=, then find the value of (A-B) (2A+B)
Please help! :O

Himanshu · Accepted Answer

If vector A and B are two non collinear unit vectors and if |A+B|=, then find the value of (A-B).(2A+B) Please help! :O