Graphs of the Trig
Functions
Objective
To use the graphs of the
trigonometric functions.
The Sine Function – y = sin x
The Cosine Function – y = cos x
The Tangent Function – y = tan x
The Cosecant Function – y = csc x
The Secant Function – y = sec x
The Cotangent Function – y = cot x
Periodic Function and Period
•The graphs of the trig functions are periodic, meaning
they repeat themselves every 180° or every 360°.
We can find 0’s, maximum values, and minimum
values easily.
Since we know that sin 90° = 1, we also know that
sin (90° + 360°k) = 1.
Use the graph of the cosine function to find the
values of q for which cos q = 1
Graph the sine curve in the interval -540° < q < 0°
Assignment
• Page 305 – 307
– # 19 – 45, 55, 59 – 61, 63