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The magnitudes of vectors vec a , vec b...

The magnitudes of vectors ` vec a , vec b` and ` vec c` are respectively `1,1` and `2.` If ` vec ax( vec ax vec c)+ vec b= vec0` , then the acute angle between ` vec a& vec c` is `pi/3` (b) `pi/6` (c) `pi/4` (d) None of these

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