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In a triangle ABC, the sides AB and AC a...

In a triangle ABC, the sides AB and AC are represented by the vectors `3hati+hatj+hatk` and `hati+2hatj+hatk` respectively. Calculate the angle `/_aBC`.

A

`cos^(-1)sqrt(5/11)`

B

`cos^(-1)sqrt(6/11)`

C

`(90^(@)-cos^(-1)sqrt(5/11))`

D

`(180^(@)-cos^(-1)sqrt(5/11))`

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