Here we see the the graphs of four rational functions. {{CMD_55}} {{ENV_56}} {{CMD_57}} Match the curves {{MATH_58}}, {{MATH_59}}, {{MATH_60}}, and {{MATH_61}} with the functions {{ENV_62}} {{CMD_63}} Consider {{MATH_64}}. This function is undefined only at {{MATH_65}}. Of the curves that we see above, {{MATH_66}} is undefined exactly at {{MATH_67}}.