In a triangle ABC, the sides AB and AC are represented by the vectors 3i^{∧}+j^{∧}+k^{∧} and i^{∧}+2j^{∧}+k^{∧} respectively. Calculate the angle ∠ ABC.

Correct Answer is : cos−1√511

(90^\circ - {\cos}^{-1} \sqrt{5/11})

(180^\circ - {\cos}^{-1} \sqrt{5/11})

WBJEE 2018 Physics Solved Paper

Question : 30 of 39

Marks: +1, -0

In a triangle ABC, the sides AB and AC are represented by the vectors 3

∧

and

∧

respectively. Calculate the angle ∠ ABC.

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