Find the absolute extrema of the function on the closed interval. y = 9 cos x, [0, 2n] || minimum (х, у) %3 maximum (х, у) %3D (smaller x-value) (х, у) (larger x-value) %D

College Algebra
7th Edition
ISBN:9781305115545
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter2: Functions
Section2.4: Average Rate Of Change Of A Function
Problem 3E
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Find the absolute extrema of the function on the closed interval.
у %3D 9 cos x,
[0, 21]
minimum
(х, у)
maximum
(х, у)
(smaller x-value)
(x, Y) = (|
(larger x-value)
Transcribed Image Text:Find the absolute extrema of the function on the closed interval. у %3D 9 cos x, [0, 21] minimum (х, у) maximum (х, у) (smaller x-value) (x, Y) = (| (larger x-value)
Expert Solution
Step 1

The first and second derivatives of the given function, f(x)=y=9cos(x), will  be given by:

f'(x)=ddx9cos(x)=9(-sin(x))=-9sin(x)

f''(x)=ddx-9sin(x)=-9(cos(x))=-9cos(x)

The critical value of the given function in the interval [0,π] will be given by solving the following equation:

f'(x)=0-9sin(x)=0sin(x)=0x=sin-1(0)=0, π, 2π

Thus, the critical values of the function in the given interval [0,2π] are x=0, π, 2π

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