Table of contents
- 0. Review of College Algebra4h 43m
- 1. Measuring Angles39m
- 2. Trigonometric Functions on Right Triangles2h 5m
- 3. Unit Circle1h 19m
- 4. Graphing Trigonometric Functions1h 19m
- 5. Inverse Trigonometric Functions and Basic Trigonometric Equations1h 41m
- 6. Trigonometric Identities and More Equations2h 34m
- 7. Non-Right Triangles1h 38m
- 8. Vectors2h 25m
- 9. Polar Equations2h 5m
- 10. Parametric Equations1h 6m
- 11. Graphing Complex Numbers1h 7m
3. Unit Circle
Trigonometric Functions on the Unit Circle
2:35 minutes
Problem 10a
Textbook Question
Textbook QuestionDetermine whether each statement is true or false. If false, tell why. csc 22° ≤ csc 68°
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Cosecant Function
The cosecant function, denoted as csc, is the reciprocal of the sine function. For any angle θ, csc(θ) = 1/sin(θ). This means that the value of csc is determined by the sine of the angle, and it is undefined when sin(θ) = 0. Understanding the behavior of the sine function is crucial for evaluating the cosecant values.
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Angle Relationships in Trigonometry
In trigonometry, the angles 22° and 68° are complementary, meaning they add up to 90°. This relationship implies that sin(22°) = cos(68°), which can be used to compare their cosecant values. Recognizing complementary angles helps in understanding how trigonometric functions relate to one another.
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Inequalities in Trigonometric Functions
When comparing trigonometric functions, it is essential to understand their ranges and behaviors. Since csc(θ) decreases as θ increases in the first quadrant (0° to 90°), we can infer that csc(22°) will be greater than csc(68°). This concept is vital for determining the truth of the given inequality.
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