[" If "|vec A+vec B|=|vec A-vec B|" ,the...

[" If "|vec A+vec B|=|vec A-vec B|" ,then the angle between vector "],[vec A&vec B" is "],[[" (1) "60^(@)," (2) "30^(@)],[" (3) "90^(@)," (4) "45^(@)]]

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