Expression 7: "Y" left parenthesis, "x" , "y" , "t" , right parenthesis equals "y" plus "t" times left parenthesis, 2 plus .2 "R" left parenthesis, "y" plus .1 1 "x" , right parenthesis , right parenthesis plus sine left parenthesis, StartFraction, "x" Over 2 , EndFraction times "t" plus 3 "t" left parenthesis, 1 minus "t" , right parenthesis , right parenthesisYx,y,t=y+t·2+.2Ry+.11x+sinx2·t+3t1−t