[AMU 1999]
A) $ u_1,.,u_2=0 $
B) $ u_1+u_2=0 $
$ u_1,.,u_2=d_1-d_2 $
$ (u_1-u_2),.,(u_1+u_2)=u_1^{2}-u_2^{2} $
Correct Answer: C
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