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Bernoulli's/Newton's classic elastica equation is of the form:

1) curvature = dθ/ds

The RHS reforms to the well known elastica equation:

2) d^{2}y/d^{2}x/(1+(dy/dx)^{2})^{3/2}

How do I get from 1) to 2)?

Regards,

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# Deriving the elastica

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