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## Homework Statement

Question:

## Homework Equations

D

_{p}=R(t)D

_{c}where R(t) is the scale factor, D

_{c}is the comoving distance

## The Attempt at a Solution

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I must have tried solving this starting 10 different ways now, starting with the fact that distance=integral over velocity dt, trying to integrate the metric itself with dphi=dtheta=0 and I just can't get anywhere at all.