Expression 2: StartFraction, 2 Over pi , EndFraction plus Start sum from "n" equals 1 to 5, end sum, cosine left parenthesis, 2 "n" "x" , right parenthesis times left parenthesis, StartFraction, 2 Over pi , EndFraction Start integral from negative StartFraction, pi Over 2 , EndFraction to 0, end integral, minus sin left parenthesis, "x" , right parenthesis times cos left parenthesis, 2 "n" "x" , right parenthesis "d" "x" plus StartFraction, 2 Over pi , EndFraction Start integral from 0 to StartFraction, pi Over 2 , EndFraction , end integral, sin left parenthesis, "x" , right parenthesis times cos left parenthesis, 2 "n" "x" , right parenthesis "d" "x" , right parenthesis2π+5∑n=1cos2nx·2π∫0−π2−sinx·cos2nxdx+2π∫π20sinx·cos2nxdx
2
Expression 3: StartAbsoluteValue, sin "x" , EndAbsoluteValuesinx