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[" 4.If "|vec a|=|vec b|=|vec a+vec b|=1...

[" 4.If "|vec a|=|vec b|=|vec a+vec b|=1," then "|vec a-vec b|" is equal to "],[[" (a) "1," (b) "sqrt(2)," (c) "sqrt(3)," (d) none of these "]]

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