$(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) $.
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