Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ ¹ ² ³ °
 

You are not logged in. #2 20070808 09:49:53
Re: proveFirst you show that sin80° = sin40° + sin20°. I have set this as a separate exercise for you to do: Last edited by JaneFairfax (20070808 09:53:15) #4 20070808 11:00:30
Re: proveNice job there Jane. "The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  Leon M. Lederman 