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If vec aa n d vec b are two vectors, su...

If ` vec aa n d vec b` are two vectors, such that ` vec adot vec b<0a n d| vec adot vec b|=| vec axx vec b|,` then the angle between vectors ` vec aa n d vec b` is `pi` b. `7pi//4` c. `pi//4` d. `3pi//4`

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