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प्रश्न
Choose the correct alternative:
If `vec"a", vec"b", vec"c"` are three non-coplanar vectors such that `vec"a" xx (vec"b" xx vec"c") = (vec"b" + vec"c")/sqrt(2)` then the angle between `vec"a"` and `vec"b"` is
विकल्प
`pi/2`
`(3pi)/4`
`pi/4`
π
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उत्तर
`(3pi)/4`
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