sgn(1/4*(1-t/2+|1-t/2|)^2)*sqrt(|1/4*(1-t/2+|1-t/2|)^2|)+D[1/4*(1-t/2+|1-t/2|)^2,{t,1}]sgn(1/4*(1-t/2+|1-t/2|)^2)*sqrt(|1/4*(1-t/2+|1-t/2|)^2|)+D[1/4*(1-t/2+|1-t/2|)^2,{t,1}]

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