What is the triangle inequality? How is it proved? Why is the inequality |a+b| |a|+|b|, where a and b are real numbers, also called the triangle inequality?

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter2: Equations And Inequalities
Section: Chapter Questions
Problem 43RE
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What is the triangle inequality? How is it proved? Why is the inequality |a+b| |a|+|b|, where a and b are real numbers, also called the triangle inequality?

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