Perturbation Theory Simple Question

1. The problem statement, all variables and given/known data



A given perturbation of βx⁶ is applied to an an-harmonic oscillator making the potential

V(x) = 1/2Kx² + βx⁶... how small must β be for the the perturbation theory to apply?







2. Relevant equations







3. The attempt at a solution

Any help? I have no idea thanks

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