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I have an online quiz, and i don't know how to start this very simple question... any suggestions?

 

"X" means cross product, NOT multiplication.

 

Question:

(unit vector of r) X (unit vector of R)

 

Recall that r represents the radial distance from the origin in cylindrical coordinates, and R represents the radial distance from the origin in spherical coordinates.

 

 

Any help will be ... helpful.

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