Posted by lina on Tuesday, April 3, 2012 at 4:16pm.
find all values of x in (o, Pi) that satify the given equation
cos x/3=1/2

precalculus  mae, Tuesday, April 3, 2012 at 4:26pm
1.5

precalculus  Steve, Tuesday, April 3, 2012 at 5:34pm
cos(pi/3) = 1/2
cos(5pi/3) = 1/2
so, x = pi or 5pi

precalculus  PS  Steve, Tuesday, April 3, 2012 at 5:35pm
oops only in [0,pi], so x=pi
However, you gave the interval as (0,pi), which excludes pi, so no solution.
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