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5.10 Hyperbolic Functions

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5.10 Hyperbolic Functions. Greg Kelly, Hanford High School, Richland, Washington. Objectives. Develop properties of hyperbolic functions. Differentiate and integrate hyperbolic functions. Develop properties of inverse hyperbolic functions.

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slide1

5.10 Hyperbolic Functions

Greg Kelly, Hanford High School, Richland, Washington

objectives
Objectives
  • Develop properties of hyperbolic functions.
  • Differentiate and integrate hyperbolic functions.
  • Develop properties of inverse hyperbolic functions.
  • Differentiate and integrate functions involving inverse hyperbolic functions.
slide3

Consider the following two functions:

These functions show up frequently enough that they

have been given names.

slide4

The behavior of these functions shows such remarkable

parallels to trig functions, that they have been given

similar names.

slide5

Hyperbolic Sine:

(pronounced “cinch x”)

Hyperbolic Cosine:

(pronounced “kosh x”)

slide6

Now, if we have “trig-like” functions, it follows that we will have “trig-like” identities.

First, an easy one:

slide8

Note that this is similar to but not the same as:

I will give you a sheet with the formulas on it to use on the test.

Don’t memorize these formulas.

slide9

Derivatives can be found relatively easily using the definitions.

Surprise, this is positive!

slide12

A hanging cable makes a shape called a catenary.

Even though it looks like a parabola, it is not a parabola!

(for some constant a)

Length of curve calculation:

slide15

If air resistance is proportional to the square of velocity:

y is the distance the object falls in t seconds.

A and B are constants.

slide16

A third application is the tractrix.

(pursuit curve)

An example of a real-life situation that can be modeled by a tractrix equation is a semi-truck turning a corner.

semi-truck

Another example is a boat attached to a rope being pulled by a person walking along the shore.

boat

slide17

A third application is the tractrix.

(pursuit curve)

a

Both of these situations (and others) can be modeled by:

semi-truck

a

boat

slide18

The word tractrix comes from the Latin tractus, which means “to draw, pull or tow”. (Our familiar word “tractor” comes from the same root.)

Other examples of a tractrix curve include a heat-seeking missile homing in on a moving airplane, and a dog leaving the front porch and chasing person running on the sidewalk.

homework
Homework

5.10 (page 403)

#1,3

15-27 odd

39-47 odd

p

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