Monday
July 28, 2014

Homework Help: Trig

Posted by Jon on Friday, February 15, 2008 at 5:53pm.

Find the exact value of sinx/2 if cosx = 2/3 and 270 < x < 360.
A)1/3
B)-1/3
C)sqrt 6/6
D)-sqrt 6/6

C, since I KNOW cosx is always positive but I don't know the work involved. I know the half angle formula

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