Chapter 5 Trigonometric Functions Copyright © 2014, 2010, 2007 Pearson Education, Inc. 1 5.4 Trigonometric Functions of Real Numbers; Periodic Functions.

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Presentation transcript:

Chapter 5 Trigonometric Functions Copyright © 2014, 2010, 2007 Pearson Education, Inc Trigonometric Functions of Real Numbers; Periodic Functions

Copyright © 2014, 2010, 2007 Pearson Education, Inc. 2 Objectives: Use a unit circle to define trigonometric functions of real numbers. Recognize the domain and range of sine and cosine functions. Use even and odd trigonometric functions. Use periodic properties.

Copyright © 2014, 2010, 2007 Pearson Education, Inc. 3 The Unit Circle A unit circle is a circle of radius 1, with its center at the origin of a rectangular coordinate system. The equation of this circle is

Copyright © 2014, 2010, 2007 Pearson Education, Inc. 4 The Unit Circle (continued) In a unit circle, the radian measure of the central angle is equal to the length of the intercepted arc. Both are given by the same real number t.

Copyright © 2014, 2010, 2007 Pearson Education, Inc. 5

6

7 Definitions of the Trigonometric Functions in Terms of a Unit Circle

Copyright © 2014, 2010, 2007 Pearson Education, Inc. 8 Example: Finding Values of the Trigonometric Functions Use the figure to find the values of the trigonometric functions at t.

Copyright © 2014, 2010, 2007 Pearson Education, Inc. 9 Example: Finding Values of the Trigonometric Functions Use the figure to find the values of the trigonometric functions at t.

Copyright © 2014, 2010, 2007 Pearson Education, Inc. 10 The Domain and Range of the Sine and Cosine Functions

Copyright © 2014, 2010, 2007 Pearson Education, Inc. 11 Even and Odd Trigonometric Functions

Copyright © 2014, 2010, 2007 Pearson Education, Inc. 12 Example: Using Even and Odd functions to Find Exact Values Find the exact value of each trigonometric function: a. b.

Copyright © 2014, 2010, 2007 Pearson Education, Inc. 13 Definition of a Periodic Function

Copyright © 2014, 2010, 2007 Pearson Education, Inc. 14 Periodic Properties of the Sine and Cosine Functions

Copyright © 2014, 2010, 2007 Pearson Education, Inc. 15 Example: Using Periodic Properties to Find Exact Values Find the exact value of each trigonometric function: a. b.

Copyright © 2014, 2010, 2007 Pearson Education, Inc. 16 Periodic Properties of the Tangent and Cotangent Functions

Copyright © 2014, 2010, 2007 Pearson Education, Inc. 17 Repetitive Behavior of the Sine, Cosine, and Tangent Functions