Expression 2: 2sine left parenthesis, "a" pi left parenthesis, "x" minus 1 half , right parenthesis , right parenthesis sine left parenthesis, left parenthesis, pi left parenthesis, StartFraction, "x" Over 6 , EndFraction minus StartFraction, "a" Over 2 , EndFraction , right parenthesis , right parenthesis , right parenthesis plus 3 "a"2sinaπx−12sinπx6−a2+3a