\((x, y, z)\)
\((r, \theta ,z)\)
\((\rho, \theta, \phi)\)
\((1,\,\_\kern-.5pt\_,\,\_\kern-.5pt\_)\)
\(\left( \_\kern-.5pt\_,\,\_\kern-.5pt\_,\dfrac{-2\sqrt{3}}{3}\right)\)
\(\left(\_\kern-.5pt\_,\dfrac{\pi}{6},\,\_\kern-.5pt\_\right)\)