If A + C = 3pi/4, sin(A + C) = sin 3pi/4. But does this necessarily imply by some formula(which I seem to be forgetting) that sin ((A + C)/2) = sin 3pi/8? Please help.
Last edited by fardeen_gen; Sep 2nd 2008 at 09:00 AM.
Reason: Grammer typo!!
If A + C = 3pi/4, sin(A + C) = sin 3pi/4. But does this necessarily imply by some formula(which I seem to be forgetting) that sin ((A + C)/2) = sin 3pi/8? Please help.
Hey you !
A+C=3pi/4
Then (A+C)/2=3pi/8
Thus sin((A+C)/2)=sin(3pi/8)