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2 \hat{i} - 3 \hat{j} + 6 \hat{k}

\cos^{- 1} (\frac{3}{49})

{os}^{- 1} (- \frac{3}{49})

{os}^{- 1} (- \frac{3}{7})

{os}^{- 1} (\frac{2}{7})

ANS : 3

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