Question: Prove the triangle inequality (|a + b| |a| + |b|) by adding the two inequalities: -lal a lal, -|b1 b |bl

Prove the triangle inequality (|a + b| ≤ |a| + |b|) by adding the two inequalities:

-lal a lal, -|b1 b |bl

-lal a lal, -|b1 b |bl

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