Expression 1: "x" squared plus "y" squared plus sine left parenthesis, 4 "x" , right parenthesis plus sine left parenthesis, 4 "y" , right parenthesis equals 4x2+y2+sin4x+sin4y=4
1
Expression 2: "y" squared plus sine left parenthesis, 4 "y" cos left parenthesis, "x" , right parenthesis , right parenthesis plus sine left parenthesis, 4 "y" sin left parenthesis, "x" , right parenthesis , right parenthesis equals 4y2+sin4ycosx+sin4ysinx=4