What do you understand by a complex or a composite signal ? Explain frequency spectrum and band width.

Explanation

### Step-by-Step Solution:

1. **Understanding Complex or Composite Signal**:
- A complex or composite signal is defined as a signal that consists of multiple components or signals combined together.
- These components have different frequencies, which means that the signal is made up of various sine waves or other waveforms, each oscillating at its own frequency.
- Mathematically, a complex signal can be represented as the sum of its individual frequency components.

2. **Defining Frequency Spectrum**:
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