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Question
Determine `veca xx vecb`, given `veca = 2hati + 3hatj and vecb = 3hati + 5hatj`.
Solution
Using determinant for vectors in two dimensions,
`veca xx vecb = |(hati,hatj),(a_x,a_y),(b_x,b_y)| = |(hati,hatj),(2,3),(3,5)|`
`= [(2xx5) - (3xx3)]hatk = (10 - 9)hatk = hatk`
`veca xx vecb` gives `hatk`
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