Let r = x i + y j + z k and r = |r|. (a) r
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Let r = x i + y j + z k and r = |r|.
(a) ∇r = r/r
(b) ∇ x r = 0
(c) ∇ x (1/r) = - r/r3
(d) ∇ In r = r/r2
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