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c^2((1/sqrt(1-(v^2/c^2)))(t-(v/c)x))^2-((1/sqrt(1-(v^2/c^2)))(x-(v/c)t))^2
c^2((1/sqrt(1-(v^2/c^2)))(t-(v/c)x))^2-((1/sqrt(1-(v^2/c^2)))(x-(v/c)t))^2
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