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Multivariable Calculus

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Rectangular to Cylindrical Conversion

MVCALC-GVEMLF

Let $P$ be a point of the surface that has equation $x=y^2$ in rectangluar coordinates.
Assume that in cylindrical coordinates, $P$ does not satisfy $\cos \theta =r \sin ^2 \theta$.

What is the distance of $P$ from the origin?