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If veca=(hati+hatj+hatk), and veca.vecb=...

If `veca=(hati+hatj+hatk), and veca.vecb=1 and vecaxxvecb = -(hati-hatk) then vecb` is
(A) `hati-hatj+hatk` (B) `2hatj-hatk` (C) `hatj` (D) `2hati`

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