?If f and g are twice differentiable functions, show that?2(fg) = f?2g + g?2f + 2?f ?g

Chapter 16, Problem 22

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QUESTION:

If f and g are twice differentiable functions, show that

2(fg) = f∇2g + g∇2f + 2∇f  ∇g

Questions & Answers

QUESTION:

If f and g are twice differentiable functions, show that

2(fg) = f∇2g + g∇2f + 2∇f  ∇g

ANSWER:

Step 1 of 2

Let and be twice differentiable functions.

To prove that

We use the following facts to prove the given identity.

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