Answer
$(0, \pi/5,1/2) \Longrightarrow (0, 0,1/2) $.
Work Step by Step
We have $$ r=0, \quad \theta =\pi/5, \quad z=1/2.$$
Now, we have
$$ x=r\cos \theta=0,$$
$$ y=r\sin \theta=0,$$
$$ z=1/2.$$
So, $(0, \pi/5,1/2) \Longrightarrow (0, 0,1/2) $.