# Solution: Find the radius of curvature at any point in the curve y + ln cos x = 0.

Find the radius of curvature at any point in the curve y + ln cos x = 0. How to find the radius of curvature at any given point in the curve?

#### Problem Statement: ECE Board November 1996

Find the radius of curvature at any point in the curve y + ln cos x = 0.
• A. cos x
• B. 1.5707
• C. sec x
• D. 1

The radius of curvature at any point in the curve is sec x

Solution:

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