vectors-m

Question: The angle between the vectors $(2\mathbf{i}+6\mathbf{j}+3\mathbf{k})$ and $(12\mathbf{i}-4\mathbf{j}+3\mathbf{k})$ is

1) ${{\cos }^{-1}}\left( \frac{1}{10} \right)$

2) ${{\cos }^{-1}}\left( \frac{9}{11} \right)$

3) ${{\cos }^{-1}}\left( \frac{9}{91} \right)$

4) ${{\cos }^{-1}}\left( \frac{1}{9} \right)$

Solution:

Explanation: No Explanation

Scalar Product Dot Product

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