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प्रश्न
Choose the correct alternative:
If `vec"a"` and `vec"b"` are unit vectors such that `[vec"a", vec"b", vec"a" xx vec"b"] = 1/4`, are unit vectors such that `vec"a"` nad `vec"b"` is
विकल्प
`pi/6`
`pi/4`
`pi/3`
`pi/2`
उत्तर
`pi/6`
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