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Prove that vecA.(vecAxxvecB)=0...

Prove that `vecA.(vecAxxvecB)=0`

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`vecA(vecAxxvecB)=0`(claim)
As `vecAxxvecB=AB sin theta hatn
`is a vector which is perpendicular to the place containing `vecA and vecB
` this implies that it is also perpendicular to `vecA`. As dot product of two perpendicular vector is zero. `vecA.(vecAxxvecB)=0`
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