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\vec{A} = \hat{i} - 2 \hat{j} - 2 \hat{k}

\vec{B} = 6 \hat{i} + 3 \hat{j} + 2 \hat{k}

\cos^{- 1} \frac{4}{25}

\cos^{- 1} \frac{2}{25}

\cos^{- 1} (\frac{- 4}{21})

\cos^{- 1} \frac{3}{25}

\cos^{- 1} \frac{4}{23}

ANS : 3

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