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# Pre-Cal 40S Slides September 20, 2007

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More on graphing trig functions.

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### Pre-Cal 40S Slides September 20, 2007

1. 1. The cosine function ... why does it look like this? fooplot an online graphing calculator
2. 2. Sketch each of the following graphs without using a calculator ...
3. 3. Sketch each of the following graphs without using a calculator ...
4. 4. Sketch each of the following graphs without using a calculator ...
5. 5. Now, put what you've learned together, graph this function ...
6. 6. Graphing Trig Functions ƒ(x) = AcosB(x - C) + D ƒ(x) = AsinB(x - C) + D The Role of Parameter A |A|is called the Amplitude A determines the distance of the maximum and minimum values from the Sinusoidal Axis continues ...
7. 7. | A | > 1 The graph is stretched A units. 0 <| A | < 1 the graph is compressed by factor A. A < 0 the graph is reflected over the sinusoidal axis. The role of Parameter B. B is not the period. B determines the period according to this relation: or The period is the distance along the x-axis required to make one quot;wavequot;.
8. 8. The role of parameter C. C is called the phase shift. (aka the horizontal shift) C > 0 the graph is shifted to the right C units C < 0 the graph is shifted left C units WARNING: watch the sign of C The role of parameter D. D is called the vertical shift, aka average value. D determines the sinusoidal axis. D > 0 the graph shifts up D units D < 0 the graph shifts down D units