Find the angle θ between the vectors a^{\to} = \:i^{\^} + \:j^{\^} + \:k^{\^} and b^{\to} = \:i^{\^}−\:j^{\^}−\:k^{\^} ?

Correct Answer is : \cos ^{−1} (−\;{1}/{3})

Agniveer Vayu or IAF Group X 15 July 2021 Shift 1 Paper

Question : 46 of 70

Marks: +1, -0

Find the angle θ between the vectors $a↖{→} = \:i↖{\^} + \:j↖{\^} + \:k↖{\^}$ and $b↖{→} = \:i↖{\^}−\:j↖{\^}−\:k↖{\^}$ ?

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