Review: Graphs of Sine and Cosine
Graph a unit circle (in degrees) and label all the points.
Using the axis below, graph one cycle of the sine function in one color. Graph one cycle of the cosine function in another color.
unit circle with points labeled (0,1), (1,0), (0,1), (1,0)
The general form for a sine equation is:
y = a*sin(b(θ-h)) + k
The general form for a cosine equation is:
y = a*cos(b(θ-h)) + k
For each function, state the amplitude, if there is a reflection, the phase shift and the vertical shift. Write "none" for transformations that do not exist.
Then, graph the function. Start by graphing the parent function y = sin θ or y = cos θ. Next, write the transformations IN THE ORDER IN WHICH THEY OCCUR. Last, graph each transformation - one at a time.
1. y = -sinθ
Amplitude: 1
Reflection: Yes
Phase Shift: None
Vertical Shift: None
Transformations:
Reflect over the x-axis
graph of y = sinθ
2. y = 2cosθ
Amplitude: 2
Reflection: None
Phase Shift: None
Vertical Shift: None
Transformations:
Vertical Stretch of 2
graph of y = 2cosθ
3. y = 1/2 cosθ
Amplitude: 1/2
Reflection: None
Phase Shift: None
Vertical Shift: None
Transformations:
Vertical Shrink of 1/2
4. y = -3sinθ
Amplitude: 3
Reflection: Yes
Phase Shift: None
Vertical Shift: None
Transformations:
Vertical Stretch of 3
Reflect over the x-axis
5. y = cosθ - 1
Amplitude: 1
Reflection: None
Phase Shift: None
Vertical Shift: Down 1
Transformations:
Down 1
6. y = sinθ + 2
Amplitude: 1
Reflection: None
Phase Shift: None
Vertical Shift: Up 2
Transformations:
Up 2
Math Graphs of Sine and Cosine Solution Key
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