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If vec(d)=vec(a)xx(vec(b)xxvec(c))+vec(b...

If `vec(d)=vec(a)xx(vec(b)xxvec(c))+vec(b)xx(vec(c)xxvec(a))+vec(c)xx(vec(a)xxvec(b))," then "`

A

`vec u` is a unit vector

B

`vecu = vec a + vec b + vec c`

C

`vec u = vec0`

D

`vec u ne vec0`

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