(vec(a) - vec(b)) xx (vec(a)+ vec(b)) is equal to

1.	(vec(a) - vec(b)) xx (vec(a)+ vec(b)) is equal to
Answer» 0 `vec(a) XX vec(b)` `2(vec(a) xx vec(b))` `\|a\|^(2) + \|b\|^(2)` Answer :C

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