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Show that area of the parallelogram whos...

Show that area of the parallelogram whose diagonals are given by `veca` and `vecb` is `(|veca xx vecb|)/2`. Also, find the area of the parallelogram, whose diagonals are `2hati - hatj + hatk` and `hati + 3hatj - hatk`.

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The correct Answer is:
`1/2sqrt(62)` units
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