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## Homework Statement

A popular model for the mass distribution in a spheroid (such as a bulge) is the

Hernquist model, with density

ρ(r) = M(total)*a / 2πr(a+r)^3

M(total) is the total mass. a is constant with dimensions of length. Derive the enclosed mass

M(r)

## The Attempt at a Solution

I am completely unsure on how to go about doing this? Any help is appreciated!