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If veca = 2veci+3vecj-veck, vecb =-veci+...

If `veca = 2veci+3vecj-veck, vecb =-veci+2vecj-4veck and vecc=veci + vecj + veck`, then find the value of `(veca xx vecb).(vecaxxvecc)`

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`vecaxxvecb= |{:(hati, hatj,hatk),(2,3,-4),(-1,2,-4):}|= - 10 veci + 9 vecj + 7 veck`
`vecaxxvecb= |{:(hati, hatj,hatk),(2,3,-1),(1,1,1):}|= - 4 veci - 3 vecj -veck` `Rightarrow (vecaxxvecb) . (vecaxxvecc) = - 40 - 27 - 7 = -74`
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