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ভেক্টর $\underset{A}{\to} = 2 \hat{i} + 3 \hat{j} + 6 \hat{k}$ এবং $\underset{B}{\to} = 3 \hat{i} + 6 \hat{j} - 2 \hat{k}$ এর মধ্যবর্তী কোণ কোনটি?

c o s^{- 1} \frac{8}{49}

c o s^{- 1} \frac{13}{49}

c o s^{- 1} \frac{13}{49}

c o s^{- 1} \frac{15}{49}

ANS : 3

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