I am the same person as https://ja.wikipedia.org/wiki/利用者:Tarnjp
( − 1 ) t = cos ( π t ) i sin ( π t ) {\displaystyle {(-1)^{t}=\cos(\pi t) i\sin(\pi t)}\,\!}
JBRam 15:23, 23 April 2007 (UTC) ;)
