Expression 2: "y" equals negative 0.2 5cosine left parenthesis, 288 pi "x" , right parenthesisy=−0.25cos288πx
2
Expression 3: "y" equals .5sine left parenthesis, 272 pi "x" , right parenthesis times sine left parenthesis, 16 pi "x" , right parenthesisy=.5sin272πx·sin16πx