What is the maximal curvature of the curve y = ln cos x?

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- Nov 28th 2008, 07:57 PMkhuezyhelp with maximum curvature
What is the maximal curvature of the curve y = ln cos x?

- Nov 28th 2008, 08:43 PMwhipflip15
Find an expression for the curvature using

http://upload.wikimedia.org/math/d/c...e1349d6094.png

Then find the maximum. - Dec 1st 2008, 06:58 PMkhuezyI'm still having
problems.

y' = -sinx/cosx or -tanx

y'' = -secx^2 - Dec 2nd 2008, 05:56 PMwhipflip15
Put those in to get

Use

and

.

So

.