Expression 1: "f" left parenthesis, "y" , right parenthesis equals left brace, "y" greater than pi : sin "y" plus 1 , 0 less than "y" less than pi : sin 5 "y" plus 1 , "y" less than 0 : sin "y" plus 1 , right bracefy=y>π:siny+1,0<y<π:sin5y+1,y<0:siny+1