2/3*(28+3*87^(1/2))^(1/3)+2/3/(28+3*87^(1/2))^(1/3)+2/3
-1/3*(28+3*87^(1/2))^(1/3)-1/3/(28+3*87^(1/2))^(1/3)+2/3+i*3^(1/2)*(1/3*(28+3*87^(1/2))^(1/3)-1/3/(28+3*87^(1/2))^(1/3))
-1/3*(28+3*87^(1/2))^(1/3)-1/3/(28+3*87^(1/2))^(1/3)+2/3-i*3^(1/2)*(1/3*(28+3*87^(1/2))^(1/3)-1/3/(28+3*87^(1/2))^(1/3))