Last edited by tony123 (2007-08-05 13:21:31)
First you show that sin80° = sin40° + sin20°. I have set this as a separate exercise for you to do:
http://www.mathsisfun.com/forum/viewtop … 580#p76580
Last edited by JaneFairfax (2007-08-07 11:53:15)
Reason #131 why I hate trig.
"In the real world, this would be a problem. But in mathematics, we can just define a place where this problem doesn't exist. So we'll go ahead and do that now..."
Nice job there Jane.
"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman
You've been so patient Janefairfax.