a. The graph y = f(x) in the xy-plane automatically has the parametrization x = x, y = f(x), and the vector formula r(x) = xi + f(x)j. Use this formula to show that if f is a twice-differentiable function of x, then |f"(x)| [1 + (f'(x))²]3/2" K(x) = b. Use the formula for k in part (a) to find the curvature of y = In (cos x), – 7/2

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter11: Topics From Analytic Geometry
Section: Chapter Questions
Problem 18T
icon
Related questions
Question

A formula for the curvature of the graph of a function in the xy-plane

a. The graph y = f(x) in the xy-plane automatically has the
parametrization x = x, y = f(x), and the vector formula
r(x) = xi + f(x)j. Use this formula to show that if f is a
twice-differentiable function of x, then
|f"(x)|
[1 + (f'(x))²]3/2"
K(x) =
b. Use the formula for k in part (a) to find the curvature of
y = In (cos x), – 7/2 <x < 7/2. Compare your answer
with the answer in Exercise 1.
c. Show that the curvature is zero at a point of inflection.
Transcribed Image Text:a. The graph y = f(x) in the xy-plane automatically has the parametrization x = x, y = f(x), and the vector formula r(x) = xi + f(x)j. Use this formula to show that if f is a twice-differentiable function of x, then |f"(x)| [1 + (f'(x))²]3/2" K(x) = b. Use the formula for k in part (a) to find the curvature of y = In (cos x), – 7/2 <x < 7/2. Compare your answer with the answer in Exercise 1. c. Show that the curvature is zero at a point of inflection.
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 8 steps with 12 images

Blurred answer
Knowledge Booster
Differentiation
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, advanced-math and related others by exploring similar questions and additional content below.
Recommended textbooks for you
Algebra & Trigonometry with Analytic Geometry
Algebra & Trigonometry with Analytic Geometry
Algebra
ISBN:
9781133382119
Author:
Swokowski
Publisher:
Cengage