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Write a possible equation for the graph below.    

Repeating wave curve, first visible high & low points: (pi halves, comma 6) & (3 pi halves, comma negative 2), continuing in that pattern, just past 2 pi, with additional highlighted points, (pi, comma 2), & (2 pi, comma 2).

Determine how the graph is altered from the graph of . What is the amplitude? Where is the midline?