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Let $R=(6,\pi/7, \pi/2)$ be a point given in spherical coordinates.

What is the correct form of $R$ in cylindrical coordinates?

$(3\sqrt{2}, \pi/7, 0)$

$(3, 2\pi/7, 3)$

$(6, \pi/14, \sqrt{3}/2)$

$(3, \pi/7, 3)$

$(6, \pi/7, 0)$