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ritwik06

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2. If for two vectors A and B; |A+B|=|A-B| then

a) |A-B|=|A|+|B|

b) |A+B|=|A|-|B|

c) |A+B|=0

d) |A.B|=0

Please let me explai, I have no idea about these questions. Please explain it to me. I have astonomy olympiad so I got them by reading the past papers.