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If `vec u = vec a - vec b, vec nu = vec a + vec b` and `|vec a| = |vec b| =2`, then `|vec u xx vec nu|` is

A

`2 sqrt(16-(veca .vec b)^(2))`

B

`2 sqrt(4-(vec a.vec b)^(2))`

C

`sqrt(16-(vec a.vec b)^(2))`

D

`sqrt(4-(vec a.vec b)^(2))`

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The correct Answer is:
A
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