Locations of horizontal tangent lines For what values of x doesƒ(x) = x - 2 cos x have a horizontal tangent line?

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.5: Trigonometric Graphs
Problem 68E
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 Locations of horizontal tangent lines For what values of x does
ƒ(x) = x - 2 cos x have a horizontal tangent line?

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