Assuming that the required partial derivatives exist and are continuous, show that (a) Div (curl F) =
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(a) Div (curl F) = 0;
(b) Curl (grad f) = 0;
(c) Div (fF) = (f) (div F) + (grad f) ∙ F;
(d) Curl (fF) = (f) (curl F) + (grad f) × F.
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