Consider the function . For this function there are two important intervals: and where the function is not defined at . Determine .

For each of the following intervals, tell whether
is increasing (input INC ) or decreasing (type in DEC ).

:
:

Note that this function has no inflection points, but we can still consider its concavity. For each of the following intervals, tell whether
is concave up (input CU ) or concave down (type in CD ).