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Question
if `bara = 3hati - 2hatj+7hatk`, `barb = 5hati + hatj -2hatk`and `barc = hati + hatj - hatk` then find `bara.(barbxxbarc)`
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Solution
`bara(barbxxbarc) = [bara barb barc] = [(a_1,a_2,a_3),(b_1,b_2,b_3),(c_1,c_2,c_3)]`
`:. bara(barbxxbarc) = |(3,-2,7),(5,1,-2),(1,1,-1)|`
= 3(-1+2) + 2(-5+2) + 7(5 -1)
= 3-6+28
= 25
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