How can you say that an oscillatory motion is a periodic motion?

Explanation

To explain how oscillatory motion is a periodic motion, we can break down the explanation into clear steps:

### Step-by-Step Solution:

1. **Define Periodic Motion**:
- Periodic motion is defined as a motion that repeats itself after a fixed time interval. This means that the motion occurs in a regular cycle.

2. **Introduce Oscillatory Motion**:
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