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In Changing from Cartesian to Polar Coordinates $\frac { \partial r } { \partial x }$

Question 6

Multiple Choice

In changing from Cartesian to polar coordinates, $\frac { \partial r } { \partial x }$ is

A) $\sin \theta$
B) $\cos \theta$
C) $\sin \theta / r$
D) $\cos \theta / r$
E) $- \sin \theta / r$

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