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If a,b,c areunit vectors and a+b+c=i+j-2k,then a.b+b.c+c.a=
Dear pallavi
a+b+c=i+j-2k
|a+b+c|2=|i+j-2k|2
|a|2 +|b|2 +|c|2 +2(a.b +b.c+c.a) =6
2(a.b +b.c+c.a) =6 -3 =3
(a.b +b.c+c.a) =3/2
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