Greatest curvature and smallest radius of curvature

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Find the smallest radius of curvature of the parabola y2=2pxy^{2}=2px.

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Find the greatest curvature of the curve y=ln⁡xy=\ln x.

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Find the greatest curvature of the curve x=acos⁡tx=a\cos t, y=bsin⁡ty=b\sin t (an ellipse).

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Find the greatest curvature of the curve y=aln⁡(1−x2a2)y=a\ln \left(1-\dfrac {x^{2}}{a^{2}}\right).

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Find the greatest curvature of the curve y=ach⁡xay=a\ch \dfrac {x}{a}.

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References

[ГюКу03] Гюнтер Н.М., Кузьмин Р.О. Сборник задач по высшей математике. 13-е изд., Издательство «Лань», 2003.