表达式3: Start sum from "n" equals 1 to "k" , end sum, StartFraction, "n" Superscript, left parenthesis, 2 "m" plus 1 , right parenthesis , Baseline Over "e" Superscript, StartNestedFraction, "n" pi NestedOver "a" , EndNestedFraction , Baseline minus "e" Superscript, negative StartNestedFraction, "n" pi NestedOver "a" , EndNestedFraction , Baseline , EndFractionk∑n=1n2m+1enπa−e−nπa
equals=
256256
3
表达式4: Start sum from "n" equals 1 to "k" , end sum, StartFraction, "n" Superscript, left parenthesis, 2 "m" minus 1 , right parenthesis , Baseline Over "e" Superscript, StartNestedFraction, "n" pi NestedOver "a" , EndNestedFraction , Baseline plus left parenthesis, negative 1 , right parenthesis Superscript, left parenthesis, "n" plus "m" minus 1 , right parenthesis , Baseline , EndFractionk∑n=1n2m−1enπa+−1n+m−1
