Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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A graphing calculator is recommended.
Use the Squeeze Theorem to show that
lim x→0 x2 cos(16?x) = 0.
Illustrate by graphing the functions
f(x) = −x2,
g(x) = x2 cos(16?x),
and
h(x) = x2
on the same screen.Let
f(x) = −x2, g(x) = x2 cos(16?x),
and
h(x) = x2.
Then
≤ cos(16?x) ≤
⇒
≤ x2 cos(16?x) ≤ .
Since
lim x→0 f(x) = lim x→0 h(x) = ,
by the Squeeze Theorem we have
lim x→0 g(x) = .
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