For the derivative: dy/dt = ry ln(K/y)(adsbygoogle = window.adsbygoogle || []).push({});

I am trying to solve the second derivative. It seems like an easy solution, and I did:

d^2y/dt^2 = rln(K/y)y' + ry(y/K)

which simplifies to:

d^2y/dt^2 = (ry')[ln(K/y) + 1/Kln(K/y)

Unfortunately, the answer is d^2y/dt^2 (ry')[ln(K/y) - 1] and I don't quite see where I went wrong. Any help would be greatly appreciated!

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# Second derivative of an autonomous function

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