A few days ago
The sine of angle theta…?
If sin of theta= – 3/5and theta is in quadrant IV, finde the exact value of cos theta.
Can you explain me on how to do this. I’m totally lost D:
Top 1 Answers
A few days ago
Favorite Answer
Given: sin of theta= – 3/5
Given: theta is in quadrant IV
http://en.wikipedia.org/wiki/Cosine#Identities shows that :
sin(theta)^2 + cos(theta)^2 = 1
So…
(-3/5)^2 + cos(theta)^2 = 1
cos(theta)^2 = 1 – (-3/5)^2
cos(theta)^2 = 1 – 9/25
cos(theta)^2 = 16/25
cos(theta) = +/- (4/5)
Since theta is in the 4’th quadrant, and the cosine function is positive in the 4’th quadrant, the correct value of cos(theta) is +4/5
0
- Academic Writing
- Accounting
- Anthropology
- Article
- Blog
- Business
- Career
- Case Study
- Critical Thinking
- Culture
- Dissertation
- Education
- Education Questions
- Essay Tips
- Essay Writing
- Finance
- Free Essay Samples
- Free Essay Templates
- Free Essay Topics
- Health
- History
- Human Resources
- Law
- Literature
- Management
- Marketing
- Nursing
- other
- Politics
- Problem Solving
- Psychology
- Report
- Research Paper
- Review Writing
- Social Issues
- Speech Writing
- Term Paper
- Thesis Writing
- Writing Styles