Discussion
Converting from cylindrical to Cartesian coordinates, \( x \) equals
Answer: A
Correct answer: \( \rho \cos\phi \)
Since \( \phi \) is measured from the x axis, the projection onto that axis is \( \rho\cos\phi \) and onto the y axis \( \rho\sin\phi \). The z coordinate is common to both systems, so the conversion touches only the two transverse coordinates.
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