Expressão 4: "z" equals left parenthesis, cos left parenthesis, StartFraction, 2 pi Over "N" , EndFraction , right parenthesis , sin left parenthesis, StartFraction, 2 pi Over "N" , EndFraction , right parenthesis , right parenthesisz=cos2πN,sin2πN
4
Expressão 5: "t" equals Start sum from "n" equals 1 to "N" , end sum, left bracket, cos left parenthesis, StartFraction, floor left parenthesis, "m" , right parenthesis "n" 2 pi Over "N" , EndFraction , right parenthesis , sin left parenthesis, StartFraction, floor left parenthesis, "m" , right parenthesis "n" 2 pi Over "N" , EndFraction , right parenthesis , right bracket "s" Subscript, "f" , Baseline left bracket, "n" , right brackett=N∑n=1cosfloormn2πN,sinfloormn2πNsfn
5
Expressão 6: "r" Subscript, "e" , Baseline equals Start sum from "m" equals 0 to "N" minus 1, end sum, left parenthesis, Start sum from "n" equals 1 to "N" , end sum, "s" Subscript, "f" , Baseline left bracket, "n" , right bracket . "x" times cos left parenthesis, StartFraction, 2 pi "m" "n" Over "N" , EndFraction , right parenthesis plus "s" Subscript, "f" , Baseline left bracket, "n" , right bracket . "y" times , right parenthesisre=N−1∑m=0N∑n=1sfn.x·cos2πmnN+sfn.y·
