For some non zero vector barV, if the su...

For some non zero vector `barV`, if the sum of `bar V` and the vector obtained from `barV` by rotating it by anangle `2alpha` equals to the vector obtained from `barV` by rotating it by `alpha` then the value of `alpha`, is

`2npipm(pi)/(3)`

`npipm(pi)/(3)`

`2npipm(2pi)/(3)`

`npipm(2pi)/(3)`

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