Expression 2: "f" left parenthesis, "x" , right parenthesis equals left brace, 0 less than or equal to "x" less than or equal to 2 : 4 "x" , 2 less than "x" less than or equal to 4 : negative "x" squared plus 8 "x" minus 4 , right bracefx=0≤x≤2:4x,2<x≤4:−x2+8x−4
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Expression 3: "y" equals "f" prime left parenthesis, "x" , right parenthesisy=f′x