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Continuity and One-Sided Limits

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A hole in the function and the function not defined at that point ... f(x) is a trigonometric function. f(x) is an inverse trigonometric function. 9 ... – PowerPoint PPT presentation

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Title: Continuity and One-Sided Limits


1
Continuity and One-Sided Limits
  • Lesson 2.4

2
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3
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4
Don't let this Happen to you!
5
Intuitive Look at Continuity
  • A function withoutbreaks orjumps
  • The graph can bedrawn without lifting the pencil

?
6
Continuity at a Point
  • A function can be discontinuous at a point
  • A hole in the function and the function not
    defined at that point
  • A hole in the function, but the function is
    defined at that point

7
Continuity at a Point
  • A function can be discontinuous at a point
  • The function jumps to a different value at a
    point
  • The function goes to infinity at one or both
    sides of the point, known as a pole

8
Definition of Continuity at a Point
  • A function is continuous at a point x c if the
    following three conditions are met
  • f(c) is defined
  • For this link, determine which of the conditions
    is violated in the examples of discontinuity

x c
9
"Removing" the Discontinuity
  • A discontinuity at c is called removable if
  • If the function can be made continuous by
  • defining the function at x c
  • or redefining the function at x c
  • Go back to this link, determine which (if any) of
    the discontinuities can be removed

10
Which of These is Dis/Continuous?
  • When x 1 why or not

Are any removable?
11
Continuity Theorem
  • A function will be continuous at any number x
    c for which f(c) is defined, when
  • f(x) is a polynomial
  • f(x) is a power function
  • f(x) is a rational function
  • f(x) is a trigonometric function
  • f(x) is an inverse trigonometric function

12
Properties of Continuous Functions
  • If f and g are functions, continuous at x
    cThen
  • is continuous (where s is a
    constant)
  • f(x) g(x) is continuous
  • is continuous
  • is continuous
  • f(g(x)) is continuous

13
One Sided Continuity
  • A function is continuous from the right at a
    point x a if and only if
  • A function is continuous from the left at a point
    x b if and only if

a
b
14
Continuity on an Interval
  • The function f is said to be continuous on an
    open interval (a, b) if
  • It is continuous at each number/point of the
    interval
  • It is said to be continuous on a closed interval
    a, b if
  • It is continuous at each number/point of the
    interval and
  • It is continuous from the right at a and
    continuous from the left at b

15
Continuity on an Interval
  • On what intervals are the following functions
    continuous?

16
Intermediate Value Theorem
  • Given function f(x)
  • Continuous on closed interval a, b
  • And L is a number strictly between f(a) and f(b)
  • Then there exists at least one number c on the
    open interval (a, b) such that f(c) L

f(b)
L
f(a)
b
a
17
Locating Roots with Intermediate Value Theorem
  • Given f(a) and f(b) have opposite sign
  • One negative, the other positive
  • Then there must be a root between a and b

a
Try exercises 88, 90, and 92 pg 100
b
18
Assignment
  • Lesson 2.4A
  • Page 98
  • Exercises 1 49 odd
  • Lesson 2.4B
  • Page 99
  • Exercises 51 75, 85 105 odd
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