Download presentation
Presentation is loading. Please wait.
1
MTH 112 Elementary Functions Chapter 5 The Trigonometric Functions Section 6 – Graphs of Transformed Sine and Cosine Functions
2
Graphs of Sine & Cosine y = sin xy = cos x Period = 2 Amplitude = 1 What will different constants in different locations do to these functions?
3
Review of Transformations of Functions Compare: y = f(x) and y = -f(x) Reflection wrt the x-axis.
4
Review of Transformations of Functions Compare: y = f(x) and y = f(-x) Reflection wrt the y-axis
5
Review of Transformations of Functions Compare: y = f(x) and y = a f(x), a > 1 Vertical Stretch
6
Review of Transformations of Functions Compare: y = f(x) and y = a f(x), 0 < a < 1 Vertical Compression
7
Review of Transformations of Functions Compare: y = f(x) and y = f(bx), b > 1 Horizontal Compression
8
Review of Transformations of Functions Compare: y = f(x) and y = f(bx), 0 < b < 1 Horizontal Stretch
9
Review of Transformations of Functions Compare: y = f(x) and y = f(x - c), c > 0 Horizontal Shift Right
10
Review of Transformations of Functions Compare: y = f(x) and y = f(x - c), c < 0 Horizontal Shift Left
11
Review of Transformations of Functions Compare: y = f(x) and y = f(x) + d, d > 0 Vertical Shift Up
12
Review of Transformations of Functions Compare: y = f(x) and y = f(x) + d, d < 0 Vertical Shift Down
13
Graphs of Sine & Cosine y = sin xy = cos x Period = 2 Amplitude = 1 What will different constants in different locations do to these functions?
14
y = A sin x Amplitude = |A| A < 0 reflex wrt x-axis.
15
y = sin Bx period = 2 / B It will be assumed that B > 0 since … y = sin (-Bx) = -sin Bx y = cos (-Bx) = cos Bx
16
y = sin (x - C) C > 0 phase shift right C < 0 phase shift left
17
y = sin (Bx - C) Could rewrite as … y = sin [B(x – C/B)] period = 2 /B phase shift C/B left (+) or right(-) As before, assume that B > 0. Otherwise modify the equation.
18
y = sin x + D D > 0 translate up D < 0 translate down
19
y = A sin (Bx - C) + D y = A cos (Bx - C) + D Everything in the previous slides applies in the same way to y = cos x.
20
y = A sin (Bx - C) + D y = A cos (Bx - C) + D cos x is just a phase shift of sin x
21
y = A sin (Bx - C) + D y = A cos (Bx - C) + D Any number of these constants can be included resulting in a combination of results. They may … stretch compress reflect phase shift translate Which constants affect which characteristics? It can be assumed that B is positive.
22
y = A sin (Bx - C) + D y = A cos (Bx - C) + D Any number of these constants can be included resulting in a combination of results. They may … stretch |A| > 1 & B < 1 compress |A| 1 reflect wrt the x-axis: A < 0 phase shift C/B right (+) or left (-) translate D up (+) or down (-) Amplitude = |A| Period = 2 / B It can be assumed that B is positive. Always determine the result in this order. {
23
One more problem … What would the graph of y = x + sin x look like?
Similar presentations
© 2024 SlidePlayer.com Inc.
All rights reserved.