Expression 9: "F" equals "f" left parenthesis, "X" left parenthesis, "I" , right parenthesis , "Y" left parenthesis, "I" , right parenthesis , right parenthesisF=fXI,YI
9
Expression 10: "g" left parenthesis, "x" , "y" , right parenthesis equals "a" cosine left parenthesis, "b" StartRoot, "x" squared plus "y" squared , EndRoot , right parenthesis plus "c"gx,y=acosbx2+y2+c
10
Expression 11: "F" tilde "g" left parenthesis, "X" left parenthesis, "I" , right parenthesis , "Y" left parenthesis, "I" , right parenthesis , right parenthesisF~gXI,YI