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solve : x(2pi/60 - 2pi/(60*60)) =2*pi/3, x(2pi/(60*60) - 2pi/(60*60*60)) = 2*pi/3
solve : x(2pi/60 - 2pi/(60*60)) =2*pi/3, x(2pi/(60*60) - 2pi/(60*60*60)) = 2*pi/3
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