tag:blogger.com,1999:blog-7423697418269914273.post5867517068441793115..comments2017-10-16T09:53:51.303-07:00Comments on Paul Liu: A curious identityPaul Liuhttp://www.blogger.com/profile/16809371907394009052noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-7423697418269914273.post-26713925618278240462012-09-25T01:35:59.467-07:002012-09-25T01:35:59.467-07:00That is a very very interesting identity! Good job...That is a very very interesting identity! Good job in discovering it! Induction works, but I am curious whether or not there is some deep combinatorial meaning behind that identity (since it involves the term 2^n).<br /><br />And for the cos(pi/7)*cos(2pi/7)*cos(4pi/7), I guess the "easy way" would be to write it as real part of complex exponential.shamil92http://asgarli.wordpress.com/noreply@blogger.com