Your mission, should you choose to accept it, as Agent Trigonometry is to the find the domain and the range of the function
Guidance
Here you'll combine the previous two concepts and change the amplitude, the horizontal shifts, vertical shifts, and reflections.
Example A
Graph
Solution: First, stretch the curve so that the amplitude is 4, making the maximums and minimums 4 and 4. Then, shift the curve
As for the domain, it is all real numbers because the sine curve is periodic and infinite. The range will be from the maximum to the minimum;
Example B
Graph
Solution: The 2 indicates the cosine curve is flipped and stretched so that the amplitude is 2. Then, move the curve up one unit and to the right one unit.
The domain is all real numbers and the range is
Example C
Find the equation of the sine curve below.
Solution: First, let’s find the amplitude. The range is from 1 to 5, which is a total distance of 6. Divided by 2, we find that the amplitude is 3. Halfway between 1 and 5 is
Subtracting
Making the equation
Concept Problem Revisit
The
The domain is all real numbers and the range is
Guided Practice
Graph the following functions. State the domain and range. Show two full periods.
1.
2.
3. Write one sine equation and one cosine equation for the curve below.
Answers
1. The domain is all real numbers and the range is
2. The domain is all real numbers and the range is
3. The amplitude and vertical shift is the same, whether the equation is a sine or cosine curve. The vertical shift is 2 because that is the number that is halfway between the maximum and minimum. The difference between the maximum and minimum is 1, so the amplitude is half of that, or
Explore More
Determine if the following statements are true or false.
 To change a cosine curve into a sine curve, shift the curve
π2 units.  For any given sine or cosine graph, there are infinitely many possible equations that can be written to represent the curve.
 The amplitude is the same as the maximum value of the sine or cosine curve.
 The horizontal shift is always in terms of
π .  The domain of any sine or cosine function is always all real numbers.
Graph the following sine or cosine functions such that

y=sin(x+π4)+1 
y=2−3cosx 
y=34sin(x−2π3) 
y=−5sin(x−3)−2 
y=2cos(x+5π6)−1.5 
y=−2.8cos(x−8)+4
Use the graph below to answer questions 1215.
 Write a sine equation for the function where the amplitude is positive.
 Write a cosine equation for the function where the amplitude is positive.
 How often does a sine or cosine curve repeat itself? How can you use this to help you write different equations for the same graph?
 Write a second sine and cosine equation with different horizontal shifts.
Use the graph below to answer questions 1620.
 Write a sine equation for the function where the amplitude is positive.
 Write a cosine equation for the function where the amplitude is positive.
 Write a sine equation for the function where the amplitude is negative.
 Write a cosine equation for the function where the amplitude is negative.
 Describe the similarities and differences between the four equations from questions 1619.