2log5 12 -log5 8 -2log5 3
2log5(12) - log5(8) - 2log5(3) = log5(12²) - [log5(8) + 2log5(3)] = log5(144) - log5(8*3²) = log5(144/72) = log5(2) = ln2/ln5 ≈ 0.43068
