sgn(1/4*(|1+t/2|+|1-t/2|-|t|)^2*unitstep(t))*sqrt(|1/4*(|1+t/2|+|1-t/2|-|t|)^2*unitstep(t)|)sgn(1/4*(|1+t/2|+|1-t/2|-|t|)^2*unitstep(t))*sqrt(|1/4*(|1+t/2|+|1-t/2|-|t|)^2*unitstep(t)|)

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