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\vec{A} = 4 \hat{i} + 3 \hat{j} + \hat{k}

\vec{B} = \hat{i} + \hat{j} + 3 \hat{k}

\cos^{- 1} (- \frac{4}{\sqrt{286}})

\cos^{- 1} (- \frac{1}{13})

\cos^{- 1} (- \frac{1}{26})

\cos^{- 1} (- \frac{1}{65})

ANS : 1

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