If | A + B | = | A | + | B |, then angle between A and B will be
(3) 0
| A + B |2 = A2 + B2 + 2AB , and here it is given that | A + B |2 = (A + B)2 = A2 + B2 + 2AB, so
2AB = 2AB
= 1
= 0 (the vectors are parallel)
Answer: (3)
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