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)'
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- Thread Starter
- 01-10-2010 11:08
- 01-10-2010 11:09
You made this thread yesterday (and got plenty of replies):
Respond there if you still can't do it.