6.4 : Graphs of Trigonometric Functions
[Pages:41]6.4 : Graphs of Trigonometric Functions
In this section, we will 1. revisit previous sections for important concepts 2. graph the basic trig. functions (based on the definitions from prev. sections) 3. define periodicity of a graph and other properties (e.g., amplitudes) 4. graph transformed trig. functions
Definition of trig functions and the ratios of the sides
Unit circle definition
x = cos , y = sin
Example
1)
Identify
the
corresponding
(x, y )
on
the
U.C.
if
=
6
Example
2)
Find
(x, y )
if
=
11 6
Fill in the blanks
The shape of cos t for t [0, 2)
For the graph of cos t, simply follow the x coordinates of the points below on the U.C. as t increases from 0 to 2.
Characteristics of f (t) = cos t
Domain : Range : Minimum : Maximum : Zeros :
The shape of sin t for t [0, 2)
For the graph of sin t, simply follow the y coordinates of the points below on the U.C. as t increases from 0 to 2.
Characteristics of f (t) = sin t
Domain : Range : Minimum : Maximum : Zeros :
................
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