If  and B are two vectors that commute with Ô, prove the useful identity (Ô· Â)(Ô · B) = · B+ iÔ(Â × B)
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Q: ▼ × (a x b) = (V · b)a – (V · a)b + [b· V]a – [a · ▼]b - -
A: LHS : use f = a and g = b
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