Oscillation in a quartic potential

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PhyConnected
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-deleted sorry-

-DELETED SORRY-
Realized this is probably not the best place to post this type of question
 
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That's a shame; I hoped someone would have the answer. Must admit it didn't look very likely to me, as the second derivative would have to be the same near both minima, and I couldn't see why it should be.
 

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