Draw a graph to show the variation of PE, KE and total energy of a simple harmonic oscillator with displacement.

Explanation

To draw a graph showing the variation of potential energy (PE), kinetic energy (KE), and total energy (TE) of a simple harmonic oscillator with displacement (x), we will follow these steps:

### Step 1: Understand the equations for PE and KE
- **Potential Energy (PE)**: The potential energy of a simple harmonic oscillator is given by the formula:
\[ PE = \frac{1}{2} k x^2 \]
or equivalently,
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