Expression 2: left parenthesis, 1 minus "t" , right parenthesis left parenthesis, "x" squared plus "y" squared , right parenthesis plus left parenthesis, "t" , right parenthesis left parenthesis, "y" , right parenthesis equals left parenthesis, 1 minus "t" , right parenthesis left parenthesis, 1 , right parenthesis plus left parenthesis, "t" , right parenthesis left parenthesis, sin "x" , right parenthesis1−tx2+y2+ty=1−t1+tsinx