In Exercises 31–38, find a cofunction with the same value as the given expression. tan 𝜋 9
Table of contents
- 0. Review of College Algebra4h 43m
- 1. Measuring Angles40m
- 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
Defining the Unit Circle
Multiple Choice
Identify the quadrant that the given angle is located in.
7π radians
A
Quadrant I
B
Quadrant II
C
Quadrant III
D
Quadrant IV
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Verified step by step guidance1
Convert the given angle from radians to degrees to make it easier to understand. Use the conversion formula: degrees = radians × (180/π).
Calculate the degree measure of the angle: (π/7) × (180/π) = 180/7 degrees.
Simplify the expression to find the degree measure: 180/7 degrees is approximately 25.71 degrees.
Recall the quadrant system: Quadrant I is from 0 to 90 degrees, Quadrant II is from 90 to 180 degrees, Quadrant III is from 180 to 270 degrees, and Quadrant IV is from 270 to 360 degrees.
Determine which quadrant the angle falls into: Since 25.71 degrees is between 0 and 90 degrees, the angle is located in Quadrant I.
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