Expression 3: "a" Subscript, 0 , Baseline equals 0a0=0
negative 10−10
1010
3
Expression 4: "a" left parenthesis, "n" , right parenthesis equals 0an=0
4
Expression 5: "b" left parenthesis, "n" , right parenthesis equals 0bn=0
5
Expression 6: "f" left parenthesis, "t" , right parenthesis equals StartFraction, "a" Subscript, 0 , Baseline Over 2 , EndFraction plus Start sum from "n" equals 1 to "N" , end sum, left parenthesis, "a" left parenthesis, "n" , right parenthesis cos left parenthesis, StartFraction, 2 pi "n" Over "T" , EndFraction "t" , right parenthesis plus "b" left parenthesis, "n" , right parenthesis sin left parenthesis, StartFraction, 2 pi "n" Over "T" , EndFraction "t" , right parenthesis , right parenthesisft=a02+N∑n=1ancos2πnTt+bnsin2πnTt