College Algebra & Trigonometry, 2018a

432 CHAPTER 9. GRAPHING THE TRIGONOMETRIC FUNCTIONS
Now, let’s fill in the information for the x-axis. The critical values along the x-axis
are − π 3 , − π 12 , π 6 , 5π
12 , and 2π 3
3
−1
− π 3
− π 12
π
6
5π
12
2π
3
−5
The function we’re graphing is a positive sine function, so it will start at the “midline”
or zero value (which in this case is −1), go up to the maximum, back through
the mid-line to the minimum and back to the mid-line:
3
−1
− π 3
− π 12
π
6
5π
12
2π
3
−5