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find vecA xx vecB if vecA = hati ...

find ` vecA xx vecB ` if ` vecA = hati - 2 hatj + 4 hatk and vecB = 3 hati - hatj + 2hatk`

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`vecA xx vecB=|(hati,hatj,hatk),(1,-2,4),(3,-1,2)|`
`=hati (-4-(-4))- hatj (2-12 ) + k (-1-1(-6) )=10 hatj + 5 hatk`
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