Expression 2: "y" left parenthesis, "t" , right parenthesis equals .5 times "u" left parenthesis, "t" minus pi , right parenthesis times left parenthesis, 1 minus .5 "e" Superscript, left parenthesis, pi minus "t" , right parenthesis , Baseline cos left parenthesis, "t" minus pi , right parenthesis minus .5 "e" Superscript, left parenthesis, pi minus "t" , right parenthesis , Baseline sin left parenthesis, "t" minus pi , right parenthesis , right parenthesis minus .5 times "u" left parenthesis, "t" minus 2 pi , right parenthesis times left parenthesis, 1 minus .5 "e" Superscript, left parenthesis, 2 pi minus "t" , right parenthesis , Baseline cos left parenthesis, "t" minus 2 pi , right parenthesis minus .5 "e" Superscript, left parenthesis, 2 pi minus "t" , right parenthesis , Baseline sin left parenthesis, "t" minus 2 pi , right parenthesis , right parenthesis plus "e" Superscript, negative "t" , Baseline sine left parenthesis, "t" , right parenthesisyt=.5·ut−π·1−.5eπ−tcost−π−.5eπ−tsint−π−.5·ut−2π·1−.5e2π−tcost−2π−.5e2π−tsint−2π+e−tsint