You are here:
- Home
- Teens
- Homework/Study Tips
- Calculus
- Precal - Trig. Identities
Calculus/Precal - Trig. Identities
Advertisement
Question
sinxcosx=1/4
what are the solutions for this identity?
Try 15 degrees. I think that works and I have a proof if you want to see it. I'm not sure the proof is understandable yet, but when you right back, I think I will understand it better.
Note that 90-15 = 75 and that is the other angle.
The sin() and the cos() are both positive in the 1st quadrant.
Note that in the third quadrant, they are both negative.
Here, you get 180+15 = 195 degrees and 270 - 15 = 255 degrees.
Related Articles
- Promote Self-discipline - More Tips for Encouraging Employee Self-discipline
- Jack Nicholson Interview-About Schmidt Movie
- Angelina Jolie Interview - The Good Shepherd Movie
- Pierce Brosnan Interview - Laws of Attraction and Bond Movies
- Q&A with Blair McDonald of Nettwerk Music Group - Nettwerk Records - Blair McDonald of Nettwerk - Nettwerk and the RIAA
Answers by Expert:
Scotto
Expertise
Any kind of calculus question you want. I also have answered some questions in Physics (mass, momentum, falling bodies), Chemistry (charge, reactions, symbols, molecules), and Biology.
Experience
Experience in the area: I have tutored students in all areas of mathematics for over 25 years.
Education/Credentials: BSand MS in Mathematics from Oregon State University, where I completed sophomore course in Physics and Chemistry. I received both degrees with high honors.
Awards and Honors: I have passed Actuarial tests 100, 110, and 135.
Publications
Maybe not a publication, but I have respond to well oveer 7,500 questions on the PC.
Well over 2,000 of them have been in calculus.
Education/Credentials
I aquired well over 40 hours of upper division courses. This was well over the number that were required.
I graduated with honors in both my BS and MS degree from Oregon State University.
I was allowed to jump into a few junior level courses my sophomore year.
Awards and Honors
I have been nominated as the expert of the month several times.
All of my scores right now are at least a 9.8 average (out of 10).
Past/Present Clients
My past clients have been students at OSU, students at the college in South Seattle, referals from a company, friends and aquantenances, people from my church, and people like you from all over the world.
©2012 About.com, a part of The New York Times Company. All rights reserved.