Expression 3: left parenthesis, abs left parenthesis, left parenthesis, "x" squared plus "y" squared , right parenthesis squared minus "a" left parenthesis, "x" squared minus "y" squared , right parenthesis , right parenthesis , right parenthesis Superscript, 1 half , Baseline equals StartFraction, left bracket, 0 , ...1 0 , right bracket Over 10 , EndFractionabsx2+y22−ax2−y212=0,...1010
3
Expression 4: left parenthesis, "x" squared plus "y" squared , right parenthesis squared equals "a" left parenthesis, "x" squared minus "y" squared , right parenthesisx2+y22=ax2−y2