運算式 1: StartFraction, 1 Over 2cot left parenthesis, StartNestedFraction, pi NestedOver "m" , EndNestedFraction , right parenthesis , EndFraction Start sum from "n" equals 1 to "m" , end sum, StartAbsoluteValue, "x" sin left parenthesis, StartFraction, 2 pi "n" Over "m" , EndFraction , right parenthesis plus "y" cos left parenthesis, StartFraction, 2 pi "n" Over "m" , EndFraction , right parenthesis , EndAbsoluteValue equals 1 有圖檔。12cotπmm∑n=1xsin2πnm+ycos2πnm=1