Discuss the difference between \( r \) and \( \rho \).
Choose the correct answers below.
\( r \) represents the
\( \rho \) represents the

Answer

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Answer

\(\rho\) \text{ represents the mass density of a substance}

Steps

Step 1 ：\(r\) \text{ represents the radial distance in polar or spherical coordinate systems}

Step 2 ：\(\rho\) \text{ represents the mass density of a substance}