- #1

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## Homework Statement

Here is the question along with the solution:

Can anyone explain why the terms I circled in red are different? For the first term there is a negative sign but then the second term does not? Why did it disappear?

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- Thread starter theBEAST
- Start date

- #1

- 364

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Here is the question along with the solution:

Can anyone explain why the terms I circled in red are different? For the first term there is a negative sign but then the second term does not? Why did it disappear?

- #2

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You could also say that this follows from the triangle inequality, but only approximately since second derivatives may play a role at a sufficient distance.

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