수식 3: left parenthesis, "f" left parenthesis, "t" , right parenthesis , "g" left parenthesis, "t" , right parenthesis , right parenthesisft,gt
3
수식 4: "a" equals left bracket, 0 , StartFraction, 2 pi Over 20 , EndFraction , ...2 pi , right bracketa=0,2π20,...2π
4
수식 5: left parenthesis, "f" left parenthesis, "t" , right parenthesis cos left parenthesis, "a" , right parenthesis minus "g" left parenthesis, "t" , right parenthesis sin left parenthesis, "a" , right parenthesis , "f" left parenthesis, "t" , right parenthesis sin left parenthesis, "a" , right parenthesis plus "g" left parenthesis, "t" , right parenthesis cos left parenthesis, "a" , right parenthesis , right parenthesisftcosa−gtsina,ftsina+gtcosa