Which of the following is not a unit vector for all values of q

1.	Which of the following is not a unit vector for all values of q
A.	\[(\cos \theta )\mathbf{i}-(\sin \theta )\,\mathbf{j}\]
B.	\[(\sin \theta )\,\mathbf{i}+(\cos \theta )\,\mathbf{j}\]
C.	\[(\sin \,\,2\theta )\,\mathbf{i}-(\cos \theta )\,\mathbf{j}\]
D.	\[(\cos \,\,2\theta )\,\mathbf{i}-(\sin \,\,2\theta )\,\mathbf{j}\]
Answer» D. \[(\cos \,\,2\theta )\,\mathbf{i}-(\sin \,\,2\theta )\,\mathbf{j}\]

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Which of the following is not a unit vector for all values of q

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