fds
Asked by soniya | 20th Dec, 2012, 11:28: PM
Expert Answer:
(a+b+c)^2=0
or, a^2+b^2+c^2+2(a.b+b.c+c.a)=0
or, 2(a.b+b.c+c.a)=-3
or a.b+b.c+c.a=-3/2
Answered by | 20th Dec, 2012, 11:35: PM
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