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0.2 = sqrt(1+4*(pow(0.2,2))*pow(r,2)) / sqrt( pow( (1-pow(r,2)),2)+4*pow(0.2,2)*pow(r,2))
0.2 = sqrt(1+4*(pow(0.2,2))*pow(r,2)) / sqrt( pow( (1-pow(r,2)),2)+4*pow(0.2,2)*pow(r,2))
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