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The Unit Circle Academics Portal Index(单位圆学者门户指数)
4.2 TRIGONOMETRIC FUNCTIONS: THE UNIT CIRCLE
Copyright © Cengage Learning. All rights reserved.
What You Should Learn
• Identify a unit circle and describe its relationship
to real numbers.
• Evaluate trigonometric functions using the unit
circle.
• Use the domain and period to evaluate sine and
cosine functions.
• Use a calculator to evaluate trigonometric
functions.
2
The Unit Circle
3
The Unit Circle
The unit circle
x2 + y2 = 1
4
The Unit Circle
Each real number t also corresponds to a central angle
(in standard position) whose radian measure is t.
The real number t is the (directional) length of the arc
intercepted by the angle , given in radians.
5
The Trigonometric Functions
6
The Trigonometric Functions
7
The Trigonometric Functions
The unit circle has been divided into eight equal arcs,
corresponding to t-values of
8
The Trigonometric Functions
The unit circle has been divided into 12 equal arcs,
corresponding to t-values of
9
Example 1 – Evaluating Trigonometric Functions
Evaluate the six trigonometric functions at each real
number.
a. b. c. t = 0 d. t =
Solution:
a. corresponds to the point (x, y) = .
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