Engineering Homework Help

I’m working on a Engineering question and need guidance to help me study.

Derivation of continuity equation for differential element (dCV) in cylindrical and spherical coordinates.You basically have to derive equation for differential element in spherical coordinates.

please only bid if you understand the steps to the equation because i dont.

.book:Fluid Mechanics -Fundamentals and Applications by Cengel and Cimbala, 4th edition. pdf