If vec(A) = vec(B) - vec( C) then determine the angle between vec(A) a

1.	If vec(A) = vec(B) - vec( C) then determine the angle between vec(A) and vec(B)
Answer» `theta = cos^(-1) [(A^(2) + B^(2) - C^(2))/(2AB)]` `theta = SIN^(-1) [A^(2) + B^(2) - C^(2))/(2AB)]` `theta = tan^(-1) [(A^(2) + B^(2) - C^(2))/(2AB)]` `theta = cot^(-1) [(A^(2) + B^(2) - C^(2))/(2AB)]` Answer :A

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