   Chapter 4.3, Problem 47E ### Single Variable Calculus: Early Tr...

8th Edition
James Stewart
ISBN: 9781305270343

#### Solutions

Chapter
Section ### Single Variable Calculus: Early Tr...

8th Edition
James Stewart
ISBN: 9781305270343
Textbook Problem

# (a) Find the intervals of increase or decrease.(b) Find the local maximum and minimum values.(c) Find the intervals of concavity and the inflection points.(d) Use the information from parts (a)–(c) to sketch the graph. Check your work with a graphing device if you have one.f(θ) = 2 cos θ + cos2θ, 0 ≤ θ ≤ 2π

(a)

To determine

To find: On which intervals the function f(θ)=2cosθ+cos2θ on [0,2π] is increasing or decreasing.

Explanation

The given function is f(θ)=2cosθ+cos2θ .

Obtain the derivative of f(θ) .

f(θ)=ddθ(2cosθ+cos2θ)=2(sinθ)+2cosθ(sinθ)[(cosθ)=sinθ]=2sinθ2cosθsinθ

Set f(θ)=0 and solve for x.

2sinθ2cosθsinθ=02sinθ(1+cosθ)=0sinθ=0,cosθ=1sinθ=0,π,2πandθ=π<

(b)

To determine

To find: The local maximum and minimum values of the function f(θ)=2cosθ+cos2θ on [0,2π] .

(c)

To determine

To find: The intervals of concavity and the inflection points of the function f(θ)=2cosθ+cos2θ on [0,2π]

(d)

To determine

To sketch: The graph of the function using the information obtained from part (a) to part (c).

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