Expression 2: left parenthesis, "y" minus cos left parenthesis, 2.5 "x" , right parenthesis , right parenthesis "t" to the 1st power plus left parenthesis, 1 minus "t" , right parenthesis to the 4th power left parenthesis, 4 minus "x" squared minus left parenthesis, "y" minus 5 , right parenthesis squared , right parenthesis equals 0y−cos2.5xt1+1−t44−x2−y−52=0