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Find vecA xx vecB if vecA = hati - 2hatj...

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

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