Trigonometri 3 Faruk: 05 May 2012 12:59 (9 msj) 
Trigonometri Knock Out: 28 Apr 2012 20:10 (5 msj) 
Cos1.Cos3.Cos5....Cos87.Cos89=? gereksizyorumcu: 08 Feb 2011 00:25 (1 msj) cos(x+y)=m ve cos (x-y)=n ise sin²x+sin²y=? Knock Out: 23 Apr 2012 12:23 (5 msj)