Expression 3: 0 less than or equal to "y" less than or equal to "f" left parenthesis, "x" , right parenthesis left brace, negative pi less than or equal to "x" less than or equal to pi , right brace0≤y≤fx−π≤x≤π
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Expression 4: 0 greater than or equal to "y" greater than or equal to "f" left parenthesis, "x" , right parenthesis left brace, negative pi less than or equal to "x" less than or equal to pi , right brace0≥y≥fx−π≤x≤π
4
Hidden Label: left parenthesis, 0.5 , negative 1 , right parenthesis0.5,−1