Expression 1: left parenthesis, 1 half , right parenthesis sine left parenthesis, 2 pi "x" , right parenthesis plus left parenthesis, 1 quarter , right parenthesis sine left parenthesis, 4 pi "x" , right parenthesis12sin2πx+14sin4πx
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Expression 2: sine left parenthesis, 2 pi "x" , right parenthesis times cosine squared left parenthesis, pi "x" , right parenthesissin2πx·cos2πx