Possible Duplicate:
How to solve f(f(x)) = cos(x) ?
$f(f(x))=sin x$
Remember to vote up questions/answers you find interesting or helpful (requires 15 reputation points)
|
0
|
|
||||||
|
closed as exact duplicate by David Roberts, S. Carnahan♦ Jun 13 2012 at 9:38 |
|
0
|
Answered here http://mathoverflow.net/questions/17605/how-to-solve-ffx-cosx Or even more general here http://mathoverflow.net/questions/17614/solving-ffxgx |
||
|
|
You can accept an answer to one of your own questions by clicking the check mark next to it. This awards 15 reputation points to the person who answered and 2 reputation points to you.
|
-2
|
I don't know if this helps you, but you may write it also as: $f(f(x)) = \frac{1}{2} ie^{-i x}-\frac{1}{2} i e^{ix}$ |
||
|
|
