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

question 29

Multiple Choice

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

• A) \(\sin \theta \frac { \partial u } { \partial r } + \cos \theta \frac { \partial u } { \partial \theta } / r\)
• B) \(\sin \theta \frac { \partial u } { \partial r } - \cos \theta \frac { \partial u } { \partial \theta } / r\)
• C) \(\cos \theta \frac { \partial u } { \partial r } - \sin \theta \frac { \partial u } { \partial \theta } / r\)
• D) \(\cos \theta \frac { \partial u } { \partial r } + \cos \theta \frac { \partial u } { \partial \theta } / r\)
• E) \(\sin \theta \frac { \partial u } { \partial r } + \cos \theta \frac { \partial u } { \partial \theta }\)

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