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If either vector A,B,C of a triangle AB...

If either vector A,B,C of a triangle ABC are (1,2,3),(-1,0,0),(0,1,2), respectively , then find `angleABC.[angleABC` is the angle between the vectors `vec(BA)andvec(BC)`].

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The correct Answer is:
`cos^(-1)((10)/(sqrt(102)))`
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