If \(\rm \vec a=2\hat i-3\hat j-\hat k, \vec b=\hat i+4\hat j-2\hat k;\) then what is \(\rm (\vec a+\vec b)\times (\vec a-\vec b)\) equal to?

1
\(\rm 2(\vec a\times \vec b)\)
2
\(-\rm 2(\vec a\times \vec b)\)
3
\(\rm (\vec a\times \vec b)\)
4
\(-\rm (\vec a\times \vec b)\)

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