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veca,vecb,vec(c) are non-zero vectors an...

`veca,vecb,vec(c)` are non-zero vectors and `veca` is perpendicular to both `vecb and vec(c)`. If `|a|=2,|vecb|=3,|vec(c)|=4 and (b,c)=(2pi)/(3)`, then find `|[vecavecbvec(c)]|`.

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The correct Answer is:
`12sqrt(3)`.
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