Absolute maxima and minima Determine the location and value of the absolute extreme value of ƒ on the given interval, if they exist. ƒ(x) =x2 + cos-1x on [-1, 1]

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter4: Polynomial And Rational Functions
Section4.5: Rational Functions
Problem 51E
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Absolute maxima and minima Determine the location and value of the absolute extreme value of ƒ on the given interval, if they exist.

ƒ(x) =x2 + cos-1x on [-1, 1]

Expert Solution
Step 1

Given that ƒ(x) =x2 + cos-1x

  Differentiate fx=x2+arc cos(x)  with respect to x:

                 ddxx2+arc cos(x)=ddxx2+ddx(arc cos(x))                             =2x+-11-x2                             =2x-11-x2

 

Step 2

To find the critical point. Solve f'x=0

                   2x-11-x2=0x=12

Multiply both sides by 1-x2

            2x·1-x2-11-x21-x2=02x·1-x2-1=02x·1-x2=14x21-x2=1 Squaring on both sides4x2=1, 1-x2=1x2=14,x2=0x=±12,0

x=12 ,0 are the critical points of f on the given interval. 

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