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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