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Warm up1. Give an example of an even function? 2. Give and example of an odd function?
3. Graph y = x2 + 3
Math IV Lesson 27 • Essential Question: How do you sketch graphs of cosine and sine? • Standards: MM4A3. Students will investigate and use the graphs
of the six trigonometric functions. a. Understand and apply the six basic trigonometric functions as
functions of real numbers. b. Determine the characteristics of the graphs of the six basic
trigonometric functions. c. Graph transformations of trigonometric functions including
changing period, amplitude, phase shift, and vertical shift. d. Apply graphs of trigonometric functions in realistic contexts
involving periodic phenomena.
New Vocabulary• Trigonometric function- a function of an angle, or of an abstract
quantity, used in trigonometry, including the sine, cosine, tangent, cotangent, secant, and cosecant, and their hyperbolic counterparts.
• A function f is even if the graph of f is symmetric with respect to the y-axis. Algebraically, f is even if and only if f(-x) = f(x) for all x in the domain of f.
• Geometrically, the graph of an odd function has rotational symmetry with respect to the origin, meaning that its graph remains unchanged after rotation of 180 degrees about the origin.
• Period: the distance along the x-axis for one complete cycle• Amplitude: half the distance between the minimum and maximum
values of the range of a periodic function
Homework: Worksheet on graphing cosine