You are here:

Calculus/Trig Identities

Advertisement

Expert: - 7/7/2010


Question
Does Cos^2 theta equal 2Cos theta?

Answer
No, but cos˛Θ + sin˛Θ = 1 and cos(2Θ) = 2(cos˛(Θ)-1).


Trivia on the side:

Θ is alt-233

hold down on the alt key and use the number pad to type 233, giving Θ.

using alt-226 through alt-238, they give π, Σ, σ, µ, τ, Φ, Θ, Ω, δ, ∞, φ, and ε

some would say, "Its all greek to me" and would be correct, since those are greek letters
except for ∞

π is pi, Σ is captial sigma, σ is lower case sigma, µ is mu (pronounced "myu", which is like
what a cat says), τ is tau (which rhymes with, "cow"), Φ is captital psi (which rhymes
with, "why"), Θ is theta (which rhymes with "ate a" where the last a is "uh"), Ω is omicron,
(where the first o is long, the i is short, and the second o is short) δ is delta (which you'll
find on a river), and φ is lower case psi.

Calculus

All Answers

Answers by Expert:

Ask Experts

Volunteer

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.