Question: Prove the triangle inequality |a + b| |a| + |b|. Expand |a + b| 2 = (a + b) 2 , and use the

Prove the triangle inequality |a + b| ≤ |a| + |b|. Expand |a + b|2 = (a + b)2, and use the fact that a ≤ |a|.]

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