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expand (1/3 (3(t^2 + 1)/(t^2 - 1)))^2 - (2/3 (3t/(t^2 - 1)))^2
expand (1/3 (3(t^2 + 1)/(t^2 - 1)))^2 - (2/3 (3t/(t^2 - 1)))^2
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