vectors-m

Question: Which of the following is not a unit vector for all values of $theta$



1) $(\cos \theta )\mathbf{i}-(\sin \theta )\,\mathbf{j}$
2) $(\sin \theta )\,\mathbf{i}+(\cos \theta )\,\mathbf{j}$
3) $(\sin \,\,2\theta )\,\mathbf{i}-(\cos \theta )\,\mathbf{j}$
4) $(\cos \,\,2\theta )\,\mathbf{i}-(\sin \,\,2\theta )\,\mathbf{j}$
Solution: Explanation: No Explanation
Modulus of vector Algebra of vectors

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