A) \[{{u}_{1}}\,.\,{{u}_{2}}=0\]
B) \[{{u}_{1}}+{{u}_{2}}=0\]
C) \[{{u}_{1}}\,.\,{{u}_{2}}={{d}_{1}}+{{d}_{2}}\]
D) \[({{u}_{1}}-{{u}_{2}})\,.\,({{u}_{1}}+{{u}_{2}})=d_{1}^{2}+d_{2}^{2}\]
Correct Answer: C
Solution :
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