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If vec(a),vec(b),vec(c) are the non-copl...

If `vec(a),vec(b),vec(c)` are the non-coplanar vectors, then `(vec(a).vec(b)xxvec(c))/(vec(c)xxvec(a).vec(b))+(vec(b).vec(a)xxvec(c))/(vec(c).vec(a)xxvec(b))=` ……………

A

0

B

1

C

-1

D

`(vec(a).vec(b)xxvec(c))/(vec(b)xxvec(c).vec(c))`

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