Question

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If two out of three vectors a, b, c are unit vectors a+b+c=0 and 2(a.b+b.c+c.a) +3=0 then the third vector of length ​

Answer 1

$A$$+$$B$$=$$C$

Answer 2

Step-by-step explanation:

a+b+c=0

implies

A.(a+b+c)=0

A.B+A.C=-1

A.B+B.C=-1

adding above all equations

2(A.B+B.C+C.A)=-3

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