Step 1:
The Schrödinger equation for a particle with zero energy is given by
$$
-\frac{\hbar^{2}}{2 m} \frac{d^{2} \psi}{d x^{2}}+U \psi=0
$$
where $\hbar$ is the reduced Planck constant, $m$ is the mass of the particle, $\psi$ is the wave function of the particle,
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