Solution (source code)

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= Solution

The https://www-thphys.physics.ox.ac.uk/people/AndreiStarinets/TUTORIALS_NOTES_GR/gr-cosmology-exam-paper-2011-solutions.pdf#page=13[official notes, PDF pp. 13–14, handwritten pp. 6–7] integrate the radial <geodesic equations> and establish the vanishing integration constant for a <null geodesic>.

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