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Cylindrical to Spherical (Point)

MVCALC-XROYKC

Let $P=(12,\pi/5, -9)$ be a point given in cylindrical coordinates.

What is the correct form of $P$ in spherical coordinates?

A

$(15,\pi/5, 2.214)$

B

$(225,\pi/10, -0.644)$

C

$(21,\pi/5, -0.644)$

D

$(3,\pi/5, 2.214)$

E

$(\sqrt{15},\pi/5, -2.214)$