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[" 23.If "vec a*vec b=0" and "vec a+vec ...

[" 23.If "vec a*vec b=0" and "vec a+vec b" makes an angle of "30^(@)" with "vec a" ,then "],[[" (a) "|vec b|,=2|vec a|," (b) "|vec a|=2|vec b|," (c) "|vec a|=sqrt(2)|vec b|," (d) "|vec a|=sqrt(3)|vec b|]]

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