Riley, I have a pressing question. {{CMD_7}} Tell me. Tell me everything. {{CMD_8}} Think about the function {{MATH_9}} {{CMD_10}} OK. {{CMD_11}} Is this function equal to {{MATH_12}}? {{CMD_13}} Well if I plot them with my calculator, they look the same. {{CMD_14}} I know! {{CMD_15}} And I suppose if I write {{ENV_16}} {{CMD_17}} Sure! But what about when {{MATH_18}}? In this case {{MATH_19}} {{CMD_20}} Right, {{MATH_21}} is undefined because we cannot divide by zero. Hmm. Now I see the problem. Yikes! {{CMD_22}}