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Graphs of Sine and Cosine Functions

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Graphs of Sine and Cosine Functions

Section 4.5

Who cares about waves??

Creating the Graphs

Sine graph plotted

Cosine graph plotted

One complete cycle of the cosine and sine graphs is called the ___period___

What did you find???

Key Points

What are key points? What do they mean?

- Where do they graphs come from?!?
- Graphing Sine and Cosine – Review
- graphing sine and cosine - radians

Sinx:(0°,0) (90°, 1) (180°,0) (270°, -1) (360°, 0)

Cosx:(0°,1) (90°,0) (180°, -1) (270°, 0) (360°, -1)

- We will see how transformations affect the basic sine and cosine parent graphs

- y = asin(bx – c) + d
- y = acos(bx – c) + d

- A vertical shift is the vertical distance between the midline of the graph and the x –axis.
- For y = sinx +d and y = cosx +d, the constant d causes a vertical shift in the graph
- Which value (x or y) is influenced by the change in the “d” value?

Transformations of Sine and Cosine

- The shift is d units upward for d >0
- The shift is d units downward for d< 0
- The graph oscillates about line y = d instead of x-axis
- Does the period change when “d” changes?

- The amplitude of y = asinx and y = acosx represents the vertical distance between the midline and the maximum or minimum
- Amplitude = |a|
- The constant factor “a” is a scaling factor - a vertical stretch or shrink of the basic sine and cosine curves

Transformations of Sine and Cosine

- If a ≥ 1, the basic sine curve is stretched vertically
- If a ≤ -1, the basic sine curve is reflected across the x-axis and vertically stretched
- The graph of y = asinx ranges between -a and a instead of between -1 and 1

- If 0 <a < 1, the basic sine curve is vertically shrunk
- If -1< a < 0, the basic sine curve is reflected across the x-axis and vertically shrunk
- The graph of y = asinx ranges between -a and a instead of between -1 and 1