For what values of x in [0,2pi] does the graph of f(x)= x + 2sin(x) have a horizontal tangent?

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter5: Inverse, Exponential, And Logarithmic Functions
Section5.4: Logarithmic Functions
Problem 45E
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For what values of x in [0,2pi] does the graph of f(x)= x + 2sin(x) have a horizontal tangent? 

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