表达式4: 1 half left parenthesis, cos left parenthesis, 2 pi "t" , right parenthesis plus 2 "i" left parenthesis, "t" , right parenthesis , sin left parenthesis, 2 pi "t" , right parenthesis plus 2 "j" left parenthesis, "t" , right parenthesis , right parenthesis12cos2πt+2it,sin2πt+2jt
定义域t最小值： 00
less than or equal to "t" less than or equal to≤t≤
定义域t最大值： "a"a
4
表达式5: "a" equals left parenthesis, 2 "k" minus 1 , right parenthesis squareda=2k−12
