Prove that `|overset(rarr)a-overset(rarr)b|ge|overset(rarr)a|-|overset(rarr)b|` When does the equally holds?

Explanation

To prove the inequality \(|\vec{a} - \vec{b}| \geq |\vec{a}| - |\vec{b}|\), we will follow these steps:

### Step 1: Start with the given inequality
We need to prove that:
\[ |\vec{a} - \vec{b}| \geq |\vec{a}| - |\vec{b}| \]

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