how to solve this in step by step? Thanks...
If this is an identity, then what would you like to do with it?
Or do you just want to simplfy it? Or evaluate it to a number?
Last edited by bob bundy (2011-07-19 21:38:50)
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Last edited by gAr (2011-07-20 23:43:30)
"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense" - Buddha?
"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."