does anyone know a relevant tri identity to use for this question because i really can't do it!
'If theta is an acute angle such that cos theta = 5/13 then find the exact value of sin ( theta / 2)'
Trig And Identities watch
- Thread Starter
- 01-10-2010 12:08
- 01-10-2010 12:09
You made this thread yesterday (and got plenty of replies):
Respond there if you still can't do it.