Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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Question

Transcribed Image Text:6. The "hyperbolic trigonometric functions" are specific combinations of ex-
ponential functions that appear in application frequently enough that they have their
own names. For example, the "hyperbolic cosine function" is given by
et +e-
cosh r
the "hyperbolic sine function" is given by
- e
sinh x =
2
and the "hyperbolic tangent function" is given by
sinh x
tanh x =
cosh x
(a) Use the definitions above to show that
d
tanh a
dx
1
cosh? x
(b) The velocity of a water wave with length L moving across a body of
water with depth d is given by
gL
( 2nd
tanh
27
V =
L
where g represents the acceleration due to gravity (a positive constant). What
happens to the velocity as the wave length increases without bound? That is,
evaluate
lim v
Hint: Find lim v² first, and then use that to answer the question above.
L00
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