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Let vec a, vec b, vec c are the three ve...

Let `vec a, vec b, vec c` are the three vectors such that `|vec a |=|vec b|=|vec c|=2`and angle between `vec a and vec b` is `pi/3, vec b and vec c` and `pi/3` and `vec a and vec c pi/3.`If `vec a , vec b and vec c` are sides of parallelogram

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