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`        If a,b,c areunit vectors and a+b+c=i+j-2k,then a.b+b.c+c.a=`
7 years ago

147 Points
```										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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```
7 years ago
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