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If vec a and vec b are two vectors, suc...

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

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