A) \[\mathbf{u}\times \mathbf{v}=\mathbf{v}\times \mathbf{u}\]
B) \[\mathbf{u}\,.\,\mathbf{v}=\mathbf{v}\,.\,\mathbf{u}\]
C) \[{{(\mathbf{u}\times \mathbf{v})}^{2}}={{\mathbf{u}}^{2}}\,.\,{{\mathbf{v}}^{2}}-{{(\mathbf{u}\,.\,\mathbf{v})}^{2}}\]
D) \[{{\mathbf{u}}^{2}}=\,|\mathbf{u}{{|}^{2}}\]
Correct Answer: A
Solution :
Vector product is not commutative.
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