show that (vecaxxvecb)xxvecc=vecaxx(vecb...

show that `(vecaxxvecb)xxvecc=vecaxx(vecbxxvecc)` if and only if `veca and vecc` are collinear or `(vecaxxvecc)xxvecb=vec0`

`vecbxx(veccxxveca)=vec0`

`vecaxx(vecbxxvecc)=vec0`

`veccxxveca=vecaxxvecb`

`veccxxvecb=vecbxxveca`

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