Expression 4: 2 pi "a" times StartFraction, cos left parenthesis, "x" , right parenthesis Over 10 , EndFraction2πa·cosx10
4
Expression 5: "f" left parenthesis, "x" , right parenthesis equals StartFraction, 1 Over 100 , EndFraction Start sum from "i" equals 1 to 100, end sum, cosine left parenthesis, 2 pi "x" times cos left parenthesis, 2 pi StartFraction, "i" Over 100 , EndFraction , right parenthesis , right parenthesisfx=1100100∑i=1cos2πx·cos2πi100
5
Expression 6: StartFraction, sin left parenthesis, 2 pi left parenthesis, "x" plus 1 eighth , right parenthesis , right parenthesis Over pi StartRoot, "x" , EndRoot , EndFractionsin2πx+18πx
6
Expression 7: StartFraction, sin left parenthesis, 2 pi "x" , right parenthesis Over 2 pi "x" , EndFractionsin2πx2πx