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Try as I might, I cannot understand how equation (3) with thekterm was derived. In equation (2),^{4}wis a function oft. But in thekterm after equation (3), there is a^{4}tterm in the denominator. Should it not be a^{2}tonly? What am I missing? Please help.^{1}

Regards,

Steve

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# Getting to this 4th order O.D.E.

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