Question: Let r = x i + y j + z k and r = |r|. Verify each identity. (a) r = 3 (b)

Let r = x i + y j + z k and r = |r|.

Verify each identity.
(a) ∇ • r = 3 

(b) ∇ • (r r) = 4r
(c) ∇2r3 = 12r

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