How do I prove the following identity?

| |x| -|y| | <= |x - y|

Thank you

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- June 7th 2007, 02:00 PMPersaGelltriangle inequality
How do I prove the following identity?

| |x| -|y| | <= |x - y|

Thank you - June 7th 2007, 02:10 PMThePerfectHacker
- June 7th 2007, 02:25 PMPlato
Here is a second way.