Chapter 2.4, Problem 33E

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8th Edition

James Stewart

ISBN: 9781285740621

Textbook Problem

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For what values of *x* does the graph of

To determine

**To find:** the values of x for which

Explanation

**1) Concept:**

A horizontal tangent has slope m = 0. The slope of a tangent is calculated by differentiating the function.

**2) Formula:**

Slope of tangent line is same as derivative of a function.

Slope of horizontal line is zero.

**3) Given:**

**4) Calculations:**

Since slope of horizontal line is zero, equate this derivative with zero

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