表达式4: left parenthesis, "A" left parenthesis, "t" , right parenthesis left bracket, 1 , right bracket , "A" left parenthesis, "t" , right parenthesis left bracket, 2 , right bracket , right parenthesisAt1,At2
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定义域t最小值：
less than or equal to "t" less than or equal to≤t≤
定义域t最大值： 2 pi2π
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表达式5: "T" equals 1.7 5 4T=1.754
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2 pi2π
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表达式6: "A" Subscript, 1 , Baseline left parenthesis, "t" , right parenthesis equals Start sum from "i" equals 0 to 4, end sum, "h" left parenthesis, "i" , right parenthesis StartFraction, 1 Over 1.4 Superscript, 2 "i" , Baseline , EndFraction "a" left parenthesis, 2 Superscript, 2 "i" , Baseline "t" plus 2 pi "h" left parenthesis, "i" plus .5 , right parenthesis plus "i" "T" , right parenthesisA1t=4∑i=0hi11.42ia22it+2πhi+.5+iT
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表达式7: 1.7 left parenthesis, "A" Subscript, 1 , Baseline left parenthesis, "t" , right parenthesis left bracket, 1 , right bracket , "A" Subscript, 1 , Baseline left parenthesis, "t" , right parenthesis left bracket, 2 , right bracket , right parenthesis positive left parenthesis, 2.5 , 0 , right parenthesis1.7A1t1,A1t2+2.5,0
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定义域t最小值：
less than or equal to "t" less than or equal to≤t≤
