Find the angle between the vectors \(\vec{a}=-\hat{i}+\hat{j}-\hat{k}\ – McqOptions

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1.	Find the angle between the vectors \(\vec{a}=-\hat{i}+\hat{j}-\hat{k}\) and \(\vec{b}=\hat{i}-\hat{j}\)
A.	\(cos^{-1}⁡-\frac{\sqrt{3}}{2}\)
B.	\(cos^{-1}⁡-\frac{2}{\sqrt{3}}\)
C.	\(cos^{-1}⁡-\sqrt{2}\)
D.	\(cos^{-1}⁡-\sqrt{\frac{3}{2}}\)
Answer» E.

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