vectors-m

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

1) ${{\cos }^{-1}}\frac{2}{\sqrt{7}}$

2) ${{\sin }^{-1}}\frac{2}{\sqrt{7}}$

3) ${{\cos }^{-1}}\frac{2}{\sqrt{5}}$

4) ${{\sin }^{-1}}\frac{2}{\sqrt{5}}$

Solution:

Explanation: No Explanation

Scalar Product Dot Product

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