Determine the value of without using a calculator or the unit circle.
Table of contents
- 0. Review of College Algebra4h 45m
- 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
4. Graphing Trigonometric Functions
Graphs of the Sine and Cosine Functions
Multiple Choice
The Period for the function y=cos(bx) is T=20π. Determine the correct value of b.
A
b=101
B
b=10
C
b=20
D
b=201
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Verified step by step guidance1
Understand that the period of a cosine function y = \(\cos\)(bx) is given by T = \(\frac{2\pi}{b}\).
Set the given period T = 20\(\pi\) equal to \(\frac{2\pi}{b}\) to find the value of b.
Solve the equation 20\(\pi\) = \(\frac{2\pi}{b}\) for b by multiplying both sides by b to get 20\(\pi\) b = 2\(\pi\).
Divide both sides of the equation by 20\(\pi\) to isolate b, resulting in b = \(\frac{2\pi}{20\pi}\).
Simplify the expression \(\frac{2\pi}{20\pi}\) to find the value of b, which is \(\frac{1}{10}\).
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