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814
bio website trojansax.blogspot.com
location Los Angeles, CA
age 26
visits member for 3 years, 8 months
seen Mar 17 at 5:43

Jul
31
comment How can I understand and prove the “sum and difference formulas” in trigonometry? (cos(a ± b) = …, etc.)?
I prefer the geometric perspective too, and it just seems like you shouldn't need to know anything about imaginary numbers to understand these identities. Which is why I asked the question. The big insight I'm getting of course is that the two ways of looking at it are really not that different. Thanks!
Jul
31
awarded  Critic
Jul
31
awarded  Student
Jul
31
asked How can I understand and prove the “sum and difference formulas” in trigonometry? (cos(a ± b) = …, etc.)?
Jul
31
answered What is your favorite estimation exercise?
Jul
31
answered Why is the volume of a sphere $\frac{4}{3}\pi r^3$?
Jul
31
comment Why does Benford's Law (or Zipf's Law) hold?
Similar question: math.stackexchange.com/questions/58/…
Jul
31
comment Real life usage of Benford's Law
Similar question: math.stackexchange.com/questions/781/…
Jul
31
comment Is there a tool for drawing column and row vectors?
Looks like there is at least one interesting answer for each. Why don't you edit this question to clarify what you meant, and then start a new question for the other one?
Jul
31
comment A definition of Conway base-13 function
"and a non-terminating one ending in repeated p digits" -- this is analogous to the fact that 1/100 can be represented in base 10 as 0.01, or as 0.0099999..., correct?
Jul
31
comment A definition of Conway base-13 function
I would have used A, B, and C, like programmers do when writing numbers in hexadecimal. But then, a and b already have meaning in this context, so maybe T, E, and W (suggesting their values, Ten, Eleven, and tWelve). The p, d, and m, used by Niel de Beaudrap, is not bad either.
Jul
31
answered What is a Markov Chain?
Jul
30
awarded  Teacher
Jul
30
comment A challenge by R. P. Feynman: give counter-intuitive theorems that can be translated into everyday language
"there is a way to order the integers (or any countable set) that makes it into a continuum." Wait, really? How do you do that? Do you have a link that discusses this ordering?
Jul
30
awarded  Supporter
Jul
30
answered What calculation shortcuts exist to help or speed-up mental (or paper) calculations?