Q.If F is a differentiable point vector function and its second order partial derivative exists, then () (.) ∇ × ∇ × = ∇ × ∇ − ∇ × ∇ × = ∇ × ∇ − ∇ × ∇ × = ∇ × ∇ − ∇ × ∇ × = ∇ × ∇ − F F T. What is T?
Correct answer: None of these
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