Which of the following is not a unit vector for all
P values of \( ...
Which of the following is not a unit vector for all
P values of \( \theta \)
W
(1) \( (\cos \theta) \hat{\imath}-(\sin \theta) \hat{j} \)
(2) \( (\sin \theta) \hat{\imath}+(\cos \theta) \hat{j} \)
(3) \( (\sin 2 \theta) \hat{l}-(\cos \theta) \hat{j} \)
(4) \( (\cos 2 \theta) \hat{\imath}-(\sin 2 \theta) \hat{j} \)
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