表达式4: left parenthesis, "e" Superscript, "a" "t" , Baseline cos left parenthesis, 2 times StartFraction, 2 pi Over 4 , EndFraction plus "t" , right parenthesis , "e" Superscript, "a" "t" , Baseline sin left parenthesis, 2 times StartFraction, 2 pi Over 4 , EndFraction plus "t" , right parenthesis , right parenthesiseatcos2·2π4+t,eatsin2·2π4+t
定义域t最小值： negative 100−100
less than or equal to "t" less than or equal to≤t≤
定义域t最大值： "T"T
4
表达式5: left parenthesis, "e" Superscript, "a" "t" , Baseline cos left parenthesis, 3 times StartFraction, 2 pi Over 4 , EndFraction plus "t" , right parenthesis , "e" Superscript, "a" "t" , Baseline sin left parenthesis, 3 times StartFraction, 2 pi Over 4 , EndFraction plus "t" , right parenthesis , right parenthesiseatcos3·2π4+t,eatsin3·2π4+t
定义域t最小值： negative 100−100
less than or equal to "t" less than or equal to≤t≤
定义域t最大值： "T"T
5
表达式6: left parenthesis, "e" Superscript, "a" "t" , Baseline cos left parenthesis, 4 times StartFraction, 2 pi Over 4 , EndFraction plus "t" , right parenthesis , "e" Superscript, "a" "t" , Baseline sin left parenthesis, 4 times StartFraction, 2 pi Over 4 , EndFraction plus "t" , right parenthesis , right parenthesiseatcos4·2π4+t,eatsin4·2π4+t
定义域t最小值： negative 100−100
less than or equal to "t" less than or equal to≤t≤
