(26) Let f(x) = x?e=*. For what value(s) of x does f(x) have a horizontal tangent? (a) Find the linear approximation L(x) of f(x) = cos(x - ) at a = 0. %3D (b) Use this to approximate cos(").

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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(26) Let f(x) = x²e=*. For what value(s) of x does f(x) have a horizontal tangent?
(a) Find the linear approximation L(x) of f(x) = cos(x -) at a = 0.
(b) Use this to approximate cos(
3
Transcribed Image Text:(26) Let f(x) = x²e=*. For what value(s) of x does f(x) have a horizontal tangent? (a) Find the linear approximation L(x) of f(x) = cos(x -) at a = 0. (b) Use this to approximate cos( 3
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