Trigonometry [raw] LD24LD #24 25. Aug 2012 · 09:15 UTC · 33 hours after compo start by JokerDen · 0 I’m goof. I lost 1.5-2 hours for solving of few elementary trigonometry problems. Comments 25. Aug 2012 · 09:20 UTC Same here! Kahn academy is your friend, hahaha.