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Let vec a\ a n d\ vec b be two unit ve...

Let ` vec a\ a n d\ vec b` be two unit vectors and `alpha` be the angle between them, then ` vec a+ vec b` is a unit vectors, if
a.`alpha=pi/4` b. `alpha=pi/3` c. `alpha=(2pi)/3` d. `alpha=pi/2`

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