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

MCQOPTIONS

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} u2061- frac{ sqrt{3}}{2} )
B.	(cos^{-1} u2061- frac{2}{ sqrt{3}} )
C.	(cos^{-1} u2061- sqrt{2} )
D.	(cos^{-1} u2061- sqrt{ frac{3}{2}} )
Answer» E.

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